(UPDATED 10 SEPTEMBER 2018)
- Earned career-high No. 48 on 5 March 2018 after reaching Acapulco SF. Achieved new career-high ranking 10 times in 2017. Improved year-end ranking in 5 straight seasons (2013-17).
- Competed at inaugural Next Gen ATP Finals in 2017 (l. to Coric, Khachanov and Medvedev in RR).
- Advanced to 1st ATP World Tour SF at 2018 Acapulco and 1st QF at 2017 ATP Masters 1000 Cincinnati. At Cincinnati, ended 0-13 start to career in Round of 16 matches.
- Reached Grand Slam 3R for 1st time at 2016 US Open as 19-year-old qualifier. Youngest American to reach US Open 3R since 18-year-old Young in 2007. Also advanced to 2017 Wimbledon 3R.
- Defeated No. 14 Goffin in 2016 US Open 1R and No. 14 Bautista Agut in 2017 Cincinnati 1R for biggest wins of career.