Ricki Osterthun
Ricki Osterthun is a former tennis player from West Germany, who won one single title during his professional career.
The right-hander reached his highest singles ATP-ranking on 19 October 1987, when Osterhun became the number 58 of the world.
Career finals
Singles (1 win, 2 losses)
| Result | W–L | Date | Tournament | Surface | Opponent | Score |
| Win | 1–0 | Jul 1985 | Hilversum, Netherlands | Clay |  |