Koepfer is coached by Rhyne Williams and Billy Heiser
Nickname is Dom.
> Speaks German and English.
> Father, Thomas, is an engineer; mother, Marianne, is a pharmacist; sister, Bettina.
> Introduced to tennis by his parents, who both played.
> Played college tennis from 2013-16 at Tulane University in New Orleans, LA, USA. Two-time All-American. Earned finance degree.
> Favourite shot is backhand, surface is clay, tournament is Australian Open and city on tour is Melbourne.
> Grew up idolising countryman Tommy Haas.
> Also enjoys golf, skiing, football and basketball.
> Favourite sports team is Bayern Munich (football) and favourite athlete is basketball player Dirk Nowitzki.
> Favourite TV show is The Big Bang Theory.
> Lists schnitzel as his favourite food and Hershey’s chocolate as his guilty pleasure.
> Favourite school subject was math.
2020 — Qualified, saved 1 MP vs. de Minaur and earned biggest win of career over No. 9 Monfils en route to Rome QF (l. to No. 1 Djokovic in 3 sets). Reached 1st ATP Tour QF of career in 1st ATP Masters 1000 main draw of career…Achieved career-high No. 61 in FedEx ATP Rankings on 28 September…Reached 2R at New York (l. to Edmund), Hamburg as SE (l. to Bautista Agut) and Roland Garros (l. to Wawrinka)…Eliminated 2019 finalist McDonald en route to Dallas, USA Challenger SF (l. to Rodionov)…Beat Ostapenkov in Davis Cup debut to cap Germany’s 4-1 win over Belarus in Davis Cup Qualifiers.
2019 — Defeated No. 18 Basilashvili for biggest win of career and to reach US Open 4R as Q (l. to Medvedev)…Broke into Top 100 of ATP Rankings on 9 September and achieved career-high No. 83 on 4 November…Made winning Grand Slam debut at Wimbledon as WC (d. Krajinovic, l. to Schwartzman in 2R)…Qualified at Los Cabos (l. to Fritz in 1R) and Zhuhai (l. to Zhang Zh. in 1R)…Captured 1st ATP Challenger Tour title of career at Ilkley, GBR (d. Novak in 3rd-set TB)…Also advanced to Aptos, USA Challenger final (l. to Johnson).