Results
| Challenger Nonthaburi | 01/20 03:30 | 28 | [171] Matteo Gigante v Jason Jung [260] | 6-3,7-5 | |
| Challenger Nonthaburi | 01/19 05:10 | 27 | [195] Ryan Peniston v Jason Jung [260] | 4-6,3-6 | |
| Challenger Nonthaburi | 01/17 03:30 | 26 | [260] Jason Jung v Aziz Dougaz [230] | 6-4,7-6 | |
| Challenger Nonthaburi | 01/15 08:35 | 25 | [497] Maximus Jones v Jason Jung [260] | 2-6,1-6 | |
| Challenger Nonthaburi | 01/10 05:00 | 26 | [323] Manuel Guinard v Jason Jung [242] | 6-1,7-6 | |
| Challenger Nonthaburi | 01/09 06:15 | 25 | [371] Nick Hardt v Jason Jung [242] | 4-6,2-6 | |
| Challenger Yokohama | 11/20 07:45 | 25 | [242] Jason Jung v Yuta Shimizu [249] | 4-6,5-7 | |
| Challenger Kobe | 11/17 03:15 | 27 | [230] Tung-Lin Wu v Jason Jung [242] | 6-4,6-3 | |
| Challenger Kobe | 11/16 02:00 | 26 | [362] Yunseong Chung v Jason Jung [242] | Retired | |
| Challenger Kobe | 11/14 03:15 | 25 | [242] Jason Jung v Zdenek Kolar [179] | 6-4,7-6 | |
| Challenger Matsuyama | 11/07 01:00 | 25 | [230] Jason Jung v Yuta Shimizu [252] | 4-6,6-2,4-6 | |
| ATP Tokyo | 10/14 06:35 | 14 | [97] Taro Daniel v Jason Jung [235] | 6-7,6-3,6-3 |
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.