| French Open | 09/23 09:45 | 15 | [125] Jason Jung v Tommy Robredo [220] | 6-4,6-3 | |
| French Open | 09/21 10:20 | 14 |
[125] Jason Jung v
Yosuke Watanuki
[231] 
|
6-2,6-0 | |
| Challenger Aix en Provence | 09/08 13:35 | 25 | [110] Pedro Sousa v Jason Jung [122] | 3-6,6-2,6-4 | |
| US Open | 08/31 15:00 | 23 |
[122] Jason Jung v
Federico Coria
[103] 
|
Retired | |
| Challenger Monterrey | 03/06 18:00 | 27 | [120] Jason Jung v Ernesto Escobedo [200] | 2-6,2-6 | |
| Challenger Monterrey | 03/05 17:00 | 26 | [120] Jason Jung v Lorenzo Giustino [153] | 6-1,6-2 | |
| Challenger Monterrey | 03/03 23:20 | 25 | [120] Jason Jung v Collin Altamirano [377] | 7-6,6-7,7-6 | |
| ATP Acapulco | 02/26 01:00 | 25 |
[119] Jason Jung v
Alexander Zverev
[7] 
|
6-7,1-6 | |
| ATP Acapulco | 02/23 23:00 | 164 |
[221] Daniel Altmaier
v
Jason Jung [119] |
1-6,3-6 | |
| ATP Acapulco | 02/23 02:35 | 64 | [156] Steven Diez v Jason Jung [119] | 2-6,2-6 | |
| ATP Delray Beach | 02/18 19:35 | 25 | [269] Noah Rubin v Jason Jung [119] | Retired | |
| ATP New York | 02/16 00:00 | 28 | [98] Andreas Seppi v Jason Jung [131] | 6-3,6-2 | |
| ATP New York | 02/15 00:30 | 27 |
[40] Reilly Opelka
v
Jason Jung [131] |
7-5,4-6,4-6 | |
| ATP New York | 02/13 18:55 | 26 |
[131] Jason Jung v
Cameron Norrie
[59] 
|
6-4,6-4 | |
| ATP New York | 02/12 02:10 | 25 | [131] Jason Jung v Kevin Anderson [120] | 7-6,6-4 | |
| ATP New York | 02/10 17:00 | 164 |
[131] Jason Jung v
Mitchell Krueger
[221] 
|
6-2,6-4 | |
| ATP New York | 02/09 17:00 | 64 | Jason Jung v Gary Kushnirovich | 6-3,6-2 | |
| Challenger Dallas | 02/06 20:00 | 26 | [156] Emilio Gomez v Jason Jung [128] | 4-6,6-4,7-6 | |
| Challenger Dallas | 02/05 00:35 | 25 | [314] Kevin King v Jason Jung [128] | 6-7,4-6 | |
| Challenger Newport Beach | 01/29 20:30 | 25 |
Christopher Eubanks
v
Jason Jung |
6-4,7-5 | |
| Australian Open | 01/16 07:55 | 45 |
[186] Daniel Elahi Galan
v
Jason Jung [125] |
6-3,3-6,6-3 | |
| Australian Open | 01/14 03:45 | 44 | [255] Donald Young v Jason Jung [125] | 4-6,7-6,1-6 | |
| Challenger Canberra | 01/06 23:00 | 24 | [194] Darian King v Jason Jung [125] | 4-6,6-4,6-3 | |
| Australian Open WC | 12/08 06:00 | 29 | [128] Jason Jung v Tatsuma Ito [148] | 5-7,4-6 | |
| Australian Open WC | 12/07 04:30 | 28 | [128] Jason Jung v Duckhee Lee [250] | 6-2,6-1 | |
| Australian Open WC | 12/06 02:00 | 27 | Jason Jung v Yuki Mochizuki | 6-1,6-4 | |
| Australian Open WC | 12/05 04:55 | 26 |
Jason Jung v
Jie Cui
|
6-3,6-4 | |
| Challenger Houston | 11/15 22:35 | 27 |
[123] Marcos Giron
v
Jason Jung [130] |
6-1,2-6,6-2 | |
| Challenger Houston | 11/15 19:50 | 26 |
[217] Alexey Vatutin
v
Jason Jung [130] |
5-7,2-6 | |
| Challenger Houston | 11/13 16:00 | 25 | [350] Daniel Nguyen v Jason Jung [130] | 3-6,2-6 |
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.