Kean Yew Loh

2012 marked the start of Loh's professional career. At age 15, Loh played in his first senior tournament at the 2012 Chinese Taipei Open in October. He participated in two events, the men's singles and the mixed doubles.

In 2013, he participated in eight more tournaments throughout the year, either in the men's singles discipline, doubles, or both. His best showing was in the singles events where he reached the second round of both the Malaysia Masters and Indonesia Masters.

In 2014, Loh won that year's Singapore International Series tournament, with International Series events being the fourth tier of Badminton World Federation events at the time.

At the age of 17, Loh (world no. 139) represented Singapore at the 2015 SEA Games in the men's singles event and won a bronze after being defeated by Mohamad Arif Abdul Latif in the semi-final. He was also in the men's team in 2015, 2017, and 2019, where he won bronzes in all three editions. He also won the Singapore and Malaysia International tournaments in 2017.

Loh served his National Service (NS) for the Singapore Armed Forces (SAF) from 2016 to 2018, eventually earning the rank of corporal first class (CFC). During his service, he continued to train and play badminton for the Singapore Armed Forces Sports Association (SAFSA), as well as representing his country at various major events such as the 2017 SEA Games and the 2018 Commonwealth Games. In 2017, he stated that his goal is to eventually win an Olympic gold medal for Singapore in badminton. In 2018, he received the best sportsman award from SAFSA.

At the 2018 Commonwealth Games in Gold Coast, Loh lost to Lee Chong Wei in the quarter-finals in the men's singles event, and lost 3–0 in the bronze medal playoff to England in the Mixed team event. Loh lost to Rajiv Ouseph in the second match, losing 22–20, 15–21, 23–25 in three games. Thereafter, he won his fourth International Series/Challenge title, the 2018 Mongolia International tournament. That same year, Loh briefly joined the Langhøj Badminton Club in Denmark for 3 months.

During the Thailand Masters in 2019, as a qualifier, Loh won against China's Zhou Zeqi, Zhao Junpeng, and Chinese Taipei's Wang Tzu-wei before advancing to the semifinals. He took the semifinals against Brice Leverdez in an eventual 2–1 win. He played against China's Lin Dan in the final and won with a score of 21–19, 21–18.

At Loh's first World Championships, he lost to Chinese Taipei's Chou Tien-chen in the round of 16, losing 13–21, 21–18, 17–21 in three games.

Loh won the men's singles silver medal in the 2019 SEA Games, losing in the final match against Lee Zii Jia of Malaysia. Loh also won his first National Championships title that year, defeating compatriot Lee Wei Hong in the final.

Loh qualified for the 2020 Summer Olympics after placing 18th in the Race to Tokyo men's singles rankings. He was the flag bearer for Singapore during the Parade of Nations. In July 2021, Loh was eliminated from the Olympics in the group stage; he won a match against Aram Mahmoud in straight games, and lost to Jonatan Christie, the seventh seed, in a closely-contested rubber game.

From August 2021, Loh attended a one-month training camp in Dubai arranged by Denmark's Olympic badminton champion Viktor Axelsen, joining Axelsen and fellow players Toby Penty from England, Brian Yang from Canada, Felix Burestedt from Sweden, Lakshya Sen from India, as well as teenagers Axel Parkhoi and Marcus Viscovich from Denmark. There were 12 training sessions per week, with a training style similar to interval training with 90-second drills, said Loh. Loh followed this with three weeks of training with France's national badminton squad at INSEP near Paris.

In mid-October 2021, Loh (world no. 41) took part in the Dutch Open as the second seed. Loh won the tournament by prevailing in the finals 21–12, 21–16 over top seed Lakshya Sen (world no. 25), Loh's former training partner. It was Loh's first tournament victory since 2019; the win netted him S$1,900.

In early November 2021, Loh (world no. 39) won the 2021 Hylo Open in Saarbrücken, Germany, which was the first time he won a Super 500 event (the fourth-highest tier of the BWF World Tour). The unseeded Loh defeated top seed Chou Tien-chen (world no. 4), in the first round 21–18, 21–13. After dispatching France's Toma Junior Popov (world no. 35) and Denmark's Rasmus Gemke (world no. 13), Loh then defeated Lakshya Sen in the semi-finals 21–18, 21–12. In the finals, Loh again defeated Lee Zii Jia (world no. 8), this time with a score of 19–21, 21–13, 17–12 when Lee retired due to injury. Loh won S$32,400 in prize money as a result.

In mid-November 2021, Loh (world no. 30) took part in the 2021 Indonesia Masters, where he defeated Wang Tzu-wei (world no. 11), in the first round, but lost in the next round to Wang's compatriot Chou Tien-chen 10–21, 12–21. In late November 2021, Loh participated in the 2021 Indonesia Open, a Super 1000 tournament. In the round of 16, Loh defeated the defending 2-time world champion Kento Momota (world no. 1), from Japan, with a score of 21–7, 17–21, 21–19. Subsequent wins over Danish players Hans-Kristian Vittinghus (world no. 21) and Rasmus Gemke sent Loh into the finals, where Loh lost to Viktor Axelsen 13–21, 21–9, 13–21. His run was the best performance by a Singaporean male shuttler since Ronald Susilo's singles win at the 2004 Japan Open, a Super 750 tournament. However, the loss meant that Loh failed to qualify for the 2021 BWF World Tour Finals.

In the 2021 BWF World Championships men's singles tournament in Huelva, Spain, the unseeded Loh (world no. 22) beat reigning Olympic champion and second seed Viktor Axelsen (world no. 1) in the first round with a score of 14–21, 21–9, 21–6 on 14 December. This was Loh's first victory over his former training partner. In the second and third rounds, Loh breezed past Austria's Luka Wraber (world no. 93) 21–4, 21–8, and Thailand's Kantaphon Wangcharoen (world no. 20), the sixteenth seed, 21–4, 21–7. In the quarter-finals, Loh defeated India's Prannoy H. S. (world no. 32) 21–14, 21–12, his first victory against Prannoy after two previous losses. Thus, Loh qualified for the semi-finals and guaranteed a medal at the World Championships, a feat never achieved before by any Singaporean. While playing against Prannoy, Loh sprained his right ankle.

In the semi-finals on December 18, Loh defeated the third seed, Denmark's Anders Antonsen (world no. 3) 23–21, 21–14 to qualify for the finals. After the semi-final match, Loh's right ankle injury had deteriorated to the point that he could not walk and required a wheelchair. Loh later said that his physiotherapist (Ho Jiaying) worked on his foot from 10:30 pm to 1:30 am to ensure that he could walk again. In the finals, Loh further made Singaporean history by winning the 2021 BWF World Championships, defeating the twelfth seed, India's Srikanth Kidambi (world no. 14) in a 43-minute match with a score of 21–15, 22–20. After the win, Loh credited people from the Singapore Badminton Association, Sport Singapore, Singapore Sport Institute, and "many others" for help and support during his journey. His return to Singapore's Changi Airport was greeted with a water salute at the tarmac, similar to Joseph Schooling after he had won a gold medal at the 2016 Summer Olympics in swimming.

Loh started the season with a defeat in the final of the India Open to Lakshya Sen in straight games, with a score of 22–24, 17–21. In February, he won a historic bronze with the Singapore men's team at the Badminton Asia Team Championships, the first in the nation's history. In the process, he booked a spot in the Thomas Cup to be held in May. Loh then fell in the first rounds of the German and All England Open, where he lost to Brian Yang and Anders Antonsen respectively, both in 3 games. He later tested positive for COVID-19 while in England, and subsequently withdrew from the Swiss Open, Korea Open, and the Korea Masters, the latter two of which he chose to withdraw since he did not get a chance to train in March due to COVID-19. In his first Thomas Cup appearance, Loh played well, winning all his matches as the first singles, beating Indonesia's Anthony Sinisuka Ginting (21–13, 21–14), South Korea's Heo Kwang-hee (21–14, 21–12) and Thailand's Khosit Phetpradab (21–15, 21–18) in straight sets to earn the points for Singapore in every series. However, it turned out to be futile as Singapore went on to lose in all three series thus missing out on a place in the knockout round.

At the 2021 SEA Games in Vietnam, Loh entered the men's team event, playing the first singles for Singapore. Singapore then ended up losing 2–3 to Malaysia in the semifinals despite having a 2–0 lead, thus clinching a bronze. Later in the men's singles event, Loh was the number 1 seed. He ended up losing in the final to the number 2 seed and world number 18 Kunlavut Vitidsarn in straight sets, 13–21, 13–21. He, therefore, had to settle for the silver medal again. After the match, Loh stated that his form was "second-best" on that day and that he "could have done better".

At the 2022 Indonesia Masters, Loh, the 8th seed, won against Toma Jr Popov, Chico Aura Dwi Wardoyo, and Lu Guangzu to reach the semi-finals of the tournament, meeting the 3rd seed and world number 4 Chou Tien-chen. Loh lost the match in a closely-contested rubber set match, 16–21, 21–8, 19–21 in an hour and ten minutes, losing 2 crucial points at 19-all, ending his run at the tournament. Loh then rose back to his then career-best ranking of 9th place the next week, overtaking India's Lakshya Sen.

In early August, Loh was part of the Singaporean team who played at the Mixed Team event at the Commonwealth Games. In the group stage, Loh played against Mauritius' Julien Paul, winning in two straight games, 21–10, 21–12. Loh was rested against Barbados and went on to beat England's Toby Penty, beating him in two straight sets, 21–12, 21–12, contributing to Singapore's 4–1 win over England. Singapore topped Group B, earning the 4th seeded position. In the quarterfinals, Singapore won 3–0 against Scotland. Loh played against Callum Smith, winning 21–8, 21–5 in straight sets. Singapore met second seeds India in the semi-final. Loh lost to Lakshya Sen in the tie decider, losing 18–21, 15–21. Singapore lost 0–3 overall. In the bronze medal playoff, Singapore was playing against England. Despite beating Penty convincingly in the Group tie 4 days earlier, Loh struggled against the 54th-ranked Englishman, winning the 3-set match, 23–25, 21–11, 25–23, taking 5 match points to secure the point for Singapore. Singapore eventually won 3–0 and won the Mixed team bronze medal.

In late August, Loh, the 8th seed, crashed out at the quarterfinal stage at the World Championships held in Tokyo, losing 12–21, 21–17, 8–21 to three-time World Junior champion and 16th seed Kunlavut Vitidsarn in an hour and five minutes, failing to defend his world title from the previous world championships in Huelva.

In the first week of October, Loh rose to his then career-rank high of 5, replacing Kento Momota, who fell 2 spots after an update of ranking points. This made Loh the first men's singles player from Singapore to reach the top 5, the closest player prior to this achievement being Ronald Susilo who achieved a career high of 6th in 2004. In mid-October, at the Denmark Open, Loh defeated number 1 seed and training partner Viktor Axelsen in the quarterfinals, winning 21–17, 21–10 in 30 minutes, ending Axelsen's 39 match-winning streak he held since the All England Open. However, Loh lost in the semi-finals to Malaysia's Lee Zii Jia in straight games the next day, losing 18–21, 15–21 in 39 minutes.

In early November, Loh participated in the Hylo Open as the number 4 seed. After defeating Shi Yuqi and Shesar Hiren Rhustavito in the first and second round, Loh crashed out to 5th seed and eventual winner Anthony Sinisuka Ginting in the quarterfinals, losing in straight games, 13–21, 14–21. After the tournament concluded, Loh rose 2 spots to his new career-high ranking of 3rd, replacing Anders Antonsen who fell to 5th after an update of ranking points.

Loh managed to gain enough ranking points to qualify for the 2022 BWF World Tour Finals held in Bangkok next month, becoming the first male player from Singapore to ever qualify for the season-ending final.

In December, at the final tournament of the year, the World Tour Finals, Loh was drawn into Group B with Chou Tien-chen, Anthony Sinisuka Ginting, and Jonatan Christie. In his first group stage encounter with Chou Tien-chen, Loh defeated him in straight games, 21–15, 21–17. In his second encounter with Jonatan Christie, Loh lost in three games, 21–16, 20–22, 10–21, failing to convert his 2 match points in the second set. In his final group encounter with Anthony Sinisuka Ginting, Loh lost in straight games, 12–21, 21–23. Loh placed 3rd in the group and did not progress to the semi-finals knockout stage.

At the Asian Championships, Loh made it to his first final since the 2021 SEA Games. In the final, he lost to Anthony Sinisuka Ginting of Indonesia in straight games, with the score of 12–21, 8–21 in 28 minutes.

Taking a break after losing early at the Singapore Open, Loh made it to the final of the Korea Open, only to lose to Anders Antonsen in 3 sets, 21–11, 11–21, 19–21.

Since becoming World Champion in 2021, Loh failed to win a badminton title, despite making it to 5 tournament finals. On 31 March, Loh ended his 833 day title drought by winning the 2024 Spain Masters.

Loh crashed out of the Badminton Asia Championships 2024 in the first round, failing to repeat his 2023 run where he reached the final. His loss to Japan’s 12th-ranked Kenta Nishimoto also came just 10 days after his 2024 Spain Masters win.

At the 2024 Summer Olympics Loh breezed through the group stage, easing past the Czech Republic's Jan Louda in straight sets 21-13, 21-10 and El Salvador's Uriel Canjura in straight sets, 21-13, 21-16. In the Round of 16, Loh upset China's world number 6 Li Shifeng in straight sets, 23-21, 21-15, booking a spot in the quarterfinals. This made him the first Singaporean men's singles player to reach the quarterfinals at an Olympics since Ronald Susilo in 2004. Loh unfortunately lost the quarterfinal to the eventual Olympic gold medalist and world number 2, Dane's Viktor Axelsen. Loh was outclassed in straight sets, 21-9, 21-17 in just 49 minutes.