Dominik Koepfer (born 29 April 1994), also spelled Köpfer,[1] is a German professional tennis player.

[2] Koepfer made his ATP main draw debut at the Winston-Salem Open as a lucky loser.

Koepfer won his first match on the ATP Tour, again as a lucky loser at the Winston-Salem Open, defeating Tennys Sandgren.

After winning his maiden Challenger title in singles at the Ilkley Trophy, Koepfer earned a wild card into the Wimbledon Championships.

[3] There, he won his first Grand Slam main draw match by defeating Filip Krajinović in the first round before losing to Diego Schwartzman in straight sets.

[4] Koepfer reached his first ATP Tour Masters 1000 quarterfinal at the Italian Open, defeating Gael Monfils en route for his first top-10 win before losing to eventual champion Novak Djokovic in three sets.

[15] Playing in Munich, he was eliminated in the second round by seventh seed, compatriot, and eventual finalist Jan-Lennard Struff.

[19] At the French Open, he reached the third round for the first time and was defeated by eighth seed, former world number one, and 2009 champion Roger Federer.

[24] Representing Germany at the Summer Olympics, he reached the third round and lost to sixth seed and eventual bronze medalist, Pablo Carreño Busta.

[26] In Cincinnati, he fell in the final round of qualifying to Marcos Giron before earning a spot in the main draw as a lucky lower.

[29] Competing at the first edition of the San Diego Open, Koepfer was defeated in the first round by eventual finalist Cameron Norrie.

Due to the withdrawal of Jenson Brooksby, he entered the tournament's main draw as a lucky loser.

[33] He defeated Andy Murray in the first round, saving seven match points; his victory was named one of the top-5 comebacks of the 2021 season.

[37] At the Australian Open, Koepfer defeated Carlos Taberner before losing to 23rd seed Reilly Opelka in the second round.

[46] He then competed in the 2024 Australian Open, beginning his campaign against fellow compatriot and sixth seed Alexander Zverev, falling in four tight sets.

In doubles, alongside his compatriot Yannick Hanfmann he reached the semifinals as an unseeded pair,[47] before losing to Italian duo Simone Bolelli and Andrea Vavassori.

[48][49] He reached a second quarterfinal for the season at the 2024 Abierto Mexicano Telcel in Acapulco, defeating qualifier Térence Atmane and eight seed Frances Tiafoe.