Career
He appeared in the main draw of a Grand Slam for the first time at the 1990 Wimbledon Championships, where he lost in the opening round to countryman Michael Stich. His other two Grand Slam appearances came in 1996. He then faced second seed Thomas Muster, who beat him in straight sets.
Dier made just one quarter-final during his career on the Association of Tennis Professionals Tour, which was in the 1996 Bermuda Open.
En route he defeated two top 100 players, Michael Joyce and Nicolas Lapentti. He is now the coach of Anna-Lena Grönefeld.
Singles: (5)
Doubles: (6).