Thomas Messmer
Thomas Messmer is a German former professional tennis player.
Messmer won a World Youth Cup title with Germany in 1995 and was victorious in all four of his singles matches during the campaign. His only ATP Tour main draw appearances came at Scottsdale in 1998, losing in the first round of the singles to Richard Fromberg. He partnered with Boris Becker in the doubles.
ATP Challenger and ITF Futures finals
Doubles: 6 (1–5)
| Result | W–L | Date | Tournament | Tier | Surface | Partner | Opponents | Score |
| Loss | 0–1 | Volkswagen Challenger, Wolfsburg | Challenger | Carpet |  |