Father, Shane, is an engineer; mother, Shu, is a nurse practitioner; brother, Kevin.
Began playing tennis at age 4.
Favourite surface is hard.
Idol growing up was Fabrice Santoro.
Played at University of Michigan from 2008-11, where he studied political scienceand was a 2-time All-Big Ten selection.
(UPDATED 10 JULY 2021)
Advanced to 1st ATP Tour QF at 2018 Newport and went on to achieve career-high No. 114 and finish 2018, 2019 and 2020 as No. 1 player from Chinese Taipei.
Defeated 2018 champion Anderson and 2019 champion Opelka to reach 1st ATP Tour SF at 2020 New York as Q.
Made Grand Slam debut at 2018 Wimbledon as LL and is still seeking 1st Grand Slam main draw win (0-3).
Owns 144-129 Challenger record with titles at 2016 Chengdu, 2017Zhangjiagang, 2018 San Francisco and 2019 Gwangju.
Earned 1st ranking point at age 22 in 2012following 4-year college career at University of Michigan.