Gemouchidis's career high singles rank is World No.

He has been much more successful in doubles, where he has 15 semifinal finishes, 12 runners-up and 8 titles.

His 8 titles came in May 2008 in Heraklion, Greece, in July 2011 in Pitesti, Romania and İzmir, Turkey, in June 2012 in Tekirdağ, Turkey, with Alex Jakupovic of Greece, in June 2012 in Viterbo, Italy, and July 2012 in Bucharest and Pitesti, Romania, with Theodoros Angelinos of Greece, and in June 2010 in Cologne, Germany with Hans Podlipnik-Castillo of Chile.

Gemouchidis had more success on the junior tour, where his career high rank was World No.

As of 2008, He is the only person in the history of tennis to start from the qualifying rounds of the prestigious Orange Bowl to reach the final.