(UPDATED 19 JANUARY 2026)
- Broke into Top 200 in August 2022, Top 100 in November 2022 and Top 20 in September 2023, achieving career-high No. 5 in November 2025 before making his Nitto ATP Finals debut.
- Defeated countrymen Paul and Tiafoe en route to 2023 US Open SF, becoming youngest American man in US Open SF since Chang, 20, in 1992 and beat No. 4 Sinner for 1st ATP Masters 1000 QF at 2023 Shanghai.
- In 2025, became youngest American ATP Masters 1000 champion in Toronto since Roddick, 21, at 2004 Miami and advanced to Australian Open SF and Wimbledon QF.
- Captured 1st ATP Tour title at 2023 Tokyo, joining Bryan Shelton as 4th father-son duo to win a tour-level championship in Open Era (Phil & Taylor Dent, Ramanathan & Ramesh Krishnan, Petr & Sebastian Korda).
- Advanced to 2023 Australian Open QF at age 20 and on his 1st trip outside USA, becoming youngest American man in Aus. Open QF since Giammalva Jr., 19, in 1982, and in Grand Slam QF since Roddick, 20, at 2002 US Open.
- Upset No. 5 Ruud to reach 2022 Cincinnati 3R in ATP Masters 1000 debut at age 19, becoming youngest American man to earn Top-5 win since Roddick, 18, at 2001 Montreal (d. No. 1 Kuerten).
- Ended 2022 season on ATP Challenger Tour with 3 indoor hard titles in as many weeks at Charlottesville, Knoxville and Champaign.
- Posted 65-10 singles record in 2 seasons for University of Florida, clinching 2021 NCAA team title and 2022 NCAA singles title while being coached by his father Bryan, a former World No. 55.