| Challenger Ningbo | 10/16 04:35 | 25 | [299] Zhe Li v Jason Jung [272] | 7-6,6-2 | |
| Challenger Kaohsiung | 10/04 11:05 | 26 | [283] Jason Jung v Evgeny Donskoy [89] | 1-6,6-7 | |
| Challenger Kaohsiung | 10/03 10:00 | 25 | Jason Jung v Duckhee Lee | 3-6,6-2,7-6 | |
| Davis Cup | 09/17 02:00 | - | Hyeon Chung v Jason Jung | Cancelled | |
| Davis Cup | 09/15 04:10 | - | [208] Soon Woo Kwon v Jason Jung [240] | 6-3,6-4,2-6,7-6 | |
| Challenger Zhangjiagang | 09/10 04:00 | 29 | [285] Ze Zhang v Jason Jung [270] | 4-6,6-2,4-6 | |
| Challenger Zhangjiagang | 09/09 03:00 | 28 | [270] Jason Jung v Go Soeda [130] | 7-6,3-6,7-6 | |
| Challenger Zhangjiagang | 09/08 03:00 | 27 | [221] Di Wu v Jason Jung [270] | 6-7,3-6 | |
| Challenger Zhangjiagang | 09/07 03:00 | 26 | [287] Dayne Kelly v Jason Jung [270] | 6-3,2-6,1-6 | |
| Challenger Zhangjiagang | 09/05 06:35 | 25 | Jason Jung v Duckhee Lee | 6-4,6-1 | |
| Challenger Aptos | 08/09 19:40 | 26 | [186] Sam Groth v Jason Jung [237] | 4-6,6-3,6-0 | |
| Challenger Aptos | 08/08 19:35 | 25 |
[237] Jason Jung v
Cameron Norrie
[187] 
|
7-5,6-4 | |
| ATP Los Cabos | 08/01 04:40 | 25 |
[167] Jason Jung v
Adrian Mannarino
[42] 
|
3-6,3-6 | |
| Challenger Granby | 07/25 20:15 | 25 |
[162] Jason Jung v
Mackenzie McDonald
[221] 
|
2-6,2-6 | |
| Challenger Gatineau | 07/18 14:00 | 25 |
[164] Jason Jung v
Yasutaka Uchiyama
[172] 
|
3-6,6-7 | |
| Wimbledon Qual | 06/26 12:55 | 44 | [213] Lukas Rosol v Jason Jung [160] | 7-6,7-6 | |
| Challenger Ilkley Qual | 06/18 10:00 | 46 | [163] Jason Jung v Matthew Ebden [275] | 7-6,2-6,4-6 | |
| Challenger Ilkley Qual | 06/17 10:00 | 45 | [163] Jason Jung v Tim Smyczek [190] | 6-2,6-4 | |
| ATP Den Bosch | 06/13 09:10 | 25 | [77] Ernesto Escobedo v Jason Jung [163] | 6-4,6-2 | |
| ATP Den Bosch Qual | 06/11 09:00 | 46 | [166] Jason Jung v Dennis Novikov [174] | 6-7,2-6 | |
| ATP Den Bosch Qual | 06/10 08:30 | 45 |
[166] Jason Jung v
Mitchell Krueger
[177] 
|
6-1,6-4 | |
| French Open Qual | 05/23 09:40 | 44 | [92] Norbert Gombos v Jason Jung [166] | 6-4,6-4 | |
| Challenger Samarkand | 05/19 06:00 | 28 | [228] Aldin Setkic v Jason Jung [173] | 6-4,6-3 | |
| Challenger Samarkand | 05/18 09:40 | 27 |
[173] Jason Jung v
Alexey Vatutin
[273] 
|
7-6,7-6 | |
| Challenger Samarkand | 05/17 07:50 | 26 | Jason Jung v Denys Molchanov | 6-4,4-6,6-2 | |
| Challenger Samarkand | 05/15 06:45 | 25 | [173] Jason Jung v Prajnesh Gunneswaran [270] | 3-6,7-6,6-4 | |
| Challenger Karshi | 05/08 09:30 | 25 | [167] Jason Jung v Yaraslav Shyla [395] | 6-7,6-4,4-6 | |
| Challenger Gimcheon | 05/02 02:00 | 25 | [167] Jason Jung v Vasek Pospisil [111] | 5-7,0-6 | |
| Challenger Anning | 04/26 04:15 | 26 | [166] Jason Jung v Janko Tipsarevic [71] | 5-7,2-6 | |
| Challenger Anning | 04/24 06:30 | 25 | Jason Jung v Zihao Xia | 7-5,7-5 |
Wikipedia - Jason Jung
Jason Jung (Chinese: 莊吉生; pinyin: Zhuāng Jíshēng; Pe̍h-ōe-jī: Chng Kit-seng; Taiwanese Mandarin: [tswáŋ tɕǐ sə́ŋ]; born 15 June 1989) is an American-born Taiwanese inactive professional tennis player representing team Chinese Taipei. He has a career high ATP singles ranking of world No. 114 achieved on 30 July 2018 and has won four ATP Challenger titles. Jung has attended the University of Michigan.
History
Jung's reached his first quarterfinal at the 2018 Hall of Fame Tennis Championships in Newport, Rhode Island. He defeated veteran Nicolas Mahut in the second round, but his run was ended by Tim Smyczek, who outlasted Jung 6–1, 5–7, 6–4 in a nearly two-hour, 185-point quarterfinal match.
His career-best result is a semifinal berth at the 2020 New York Open, where he defeated former champion and former world No. 5 Kevin Anderson in the first round, followed by seventh seed Cameron Norrie in the second, before upsetting defending champion and third seed Reilly Opelka in the quarterfinals. He was eliminated in the semifinals by Italian veteran Andreas Seppi in straight sets.