- Nickname: Struffi
- Born: 1990.04.25 in Warstein, Germany
After a difficult 2022 season which saw him go down in the rankings due to an injury that kept him away from the courts for a while, Struffi made a sensational comeback in 2023. He started the year no.150 on the ATP Ranking making his way through the qualifying of the Australian Open, Indian Wells, Miami and Monte-Carlo beating world no.3 Casper Ruud to reach the Quarter-finals. In Madrid, Struffi beat Tsitsipas en route to reach his first final at a Masters 1000 event. In Stuttgart, made his second final of the season, his first on grass and reached a career-high ranking no.21 in the world.