Constantin Frantzen

Constantin Frantzen (born 16 March 1998) is a German tennis player who specializes in doubles.

Frantzen has a career high ATP doubles ranking of world No. 53, achieved on 15 July 2024. He has won six ATP Challenger doubles titles, all with partner Hendrik Jebens.

He played college tennis at Baylor University.

2023–2024: ATP and Grand Slam debuts in doubles
Frantzen made his ATP Tour doubles main draw debut at the Swiss Open Gstaad alongside Hendrik Jebens.

He reached his first ATP Tour final at the Moselle Open with partner Jebens, but lost to Hugo Nys and Jan Zieliński.

Doubles performance timeline
Current through the 2024 Hamburg Open.