| Challenger Monterrey | 03/10 21:00 | 27 | [278] Prajnesh Gunneswaran v Jason Jung [223] | 1-6,7-5,6-4 | |
| Challenger Monterrey | 03/09 18:00 | 26 | [461] Evan Zhu v Jason Jung [223] | 2-6,5-7 | |
| Challenger Monterrey | 03/08 22:50 | 25 | Strong Kirchheimer v Jason Jung | 4-6,1-6 | |
| ATP Delray Beach | 02/13 20:10 | 19 | [121] Liam Broady v Jason Jung [171] | 6-4,6-4 | |
| ATP Delray Beach | 02/12 19:40 | 14 | [187] Renzo Olivo v Jason Jung [171] | 2-6,3-6 | |
| ATP Dallas | 02/07 18:00 | 19 | [153] Jurij Rodionov v Jason Jung [171] | 4-6,6-2,6-3 | |
| ATP Dallas | 02/06 17:00 | 14 | [284] Go Soeda v Jason Jung [173] | 6-3,1-6,6-7 | |
| Challenger Cleveland | 02/02 00:35 | 25 | [173] Jason Jung v Emilio Gomez [142] | 3-6,4-6 | |
| Challenger Columbus | 01/25 20:30 | 25 | [176] Jason Jung v Ernesto Escobedo [141] | 1-6,4-6 | |
| Australian Open | 01/10 07:15 | 14 | [126] Yannick Hanfmann v Jason Jung [178] | 6-7,7-5,6-0 | |
| Challenger Bendigo | 01/06 06:20 | 26 | [164] Ernesto Escobedo v Jason Jung [178] | 6-2,4-6,6-2 | |
| Challenger Bendigo | 01/04 06:35 | 25 | [213] Camilo U Carabelli v Jason Jung [178] | 6-7,6-7 | |
| Challenger Champaign | 11/18 18:45 | 26 | [245] Go Soeda v Jason Jung [177] | 6-4,5-7,6-4 | |
| Challenger Champaign | 11/16 20:00 | 25 | [227] Mikael Torpegaard v Jason Jung [177] | 2-6,6-3,4-6 | |
| Challenger Knoxville | 11/10 17:15 | 26 | [173] Jason Jung v Christian Harrison [263] | Retired | |
| Challenger Knoxville | 11/08 19:35 | 25 | [173] Jason Jung v Jason Kubler [208] | 6-4,6-1 | |
| Challenger Charlottesville | 11/02 19:05 | 25 | [173] Jason Jung v Christian Harrison [270] | 5-7,4-6 | |
| Challenger Las Vegas | 10/25 20:55 | 25 | [166] Jason Jung v Thai-Son Kwiatkowski [232] | 5-7,2-6 | |
| ATP Indian Wells | 10/05 19:25 | 14 | [165] Jason Jung v Stefan Kozlov [253] | Retired | |
| Challenger Columbus | 09/20 16:40 | 25 | [166] Jason Jung v Ryan Peniston [309] | 3-6,4-6 | |
| Challenger Cary | 09/14 16:55 | 25 | [481] Rinky Hijikata v Jason Jung [166] | 6-4,6-4 | |
| US Open | 08/26 20:30 | 15 | [129] Mikhail Kukushkin v Jason Jung [168] | 6-4,6-3 | |
| US Open | 08/25 21:20 | 14 | [166] Sebastian Ofner v Jason Jung [168] | 5-7,4-6 | |
| ATP Washington | 07/31 16:00 | 14 | [178] Go Soeda v Jason Jung [159] | 6-4,6-7,6-4 | |
| ATP Atlanta | 07/25 16:25 | 19 | [159] Jason Jung v Bjorn Fratangelo [188] | 3-6,6-1,5-7 | |
| ATP Atlanta | 07/24 19:25 | 26 | [159] Jason Jung v Lukas Lacko [191] | 6-4,6-7,6-3 | |
| ATP Los Cabos | 07/20 00:00 | 25 | [159] Jason Jung v Evgeny Donskoy [157] | 1-6,4-6 | |
| ATP Newport | 07/15 16:45 | 27 | [37] Alexander Bublik v Jason Jung [163] | 6-2,6-4 | |
| ATP Newport | 07/14 17:55 | 26 | [163] Jason Jung v Tennys Sandgren [78] | 6-2,6-2 | |
| ATP Newport | 07/13 16:20 | 25 | [248] Brayden Schnur v Jason Jung [163] | 5-7,7-6,6-7 |
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 professional tennis player who represents the 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 world number 5 Kevin Anderson in the first round, followed by 7th seed Cameron Norrie in the second before upsetting defending champion and 3rd seed Reilly Opelka in the quarterfinals. He was eliminated in the semifinals by Italian veteran Andreas Seppi in straight sets.