Struff J-L.

Jan-Lennard Struff is a German professional tennis player on the ATP Tour. During the 2026 season, according to Tennis Post's match data, he played 20 tournaments with a record of 19 wins and 20 losses across 39 matches. His best result of the season came at Wimbledon in July, where he reached the quarter-final with a 4–1 record in the event. He also competed in two Grand Slam tournaments, reaching the second round at the US Open in September. In Masters 1000 events, he played Montreal and Cincinnati, exiting early from both.