Constantin Frantzen is a German professional tennis player born on 16 March 1998 in Düsseldorf. Specializing in doubles, he reached a career-high ATP doubles ranking of world No. 34 and won his maiden ATP Tour title at the 2025 Chengdu Open with Robin Haase. This tag page collects news, match reports, tournament results, Grand Slam updates, and career milestones covering his progress on the ATP Tour and Challenger circuit.
