Florian Mayer (born 5 October 1983) is a German professional tennis player. He plays on both the ATP Tour and the Challenger Tour. He has won nine Challenger events, which has helped him stay in the Top 50 on the rankings, and is currently the highest-ranked player without an ATP title.
Mayer reached his career-high singles ranking of World No. 19 on 23 May 2011.
Mayer has reached four ATP singles finals, two at Sopot in 2005 and 2006, one at Stockholm in 2010 and one at the 2011 BMW Open in Munich. He lost to Gaël Monfils, Nikolay Davydenko, Roger Federer and again Nikolay Davydenko respectively.