Gerald Melzer has primarily spent his time on the Futures circuit, while also playing Challengers and several doubles events with his brother.

In 2008, he has had more success playing doubles, partnering with his brother to win a challenger in Graz, Austria.

He faced his brother, Jürgen, in the first round of the 2015 Wimbledon qualifying tournament, and lost in straight sets.

[3] Gerald is also part of Austrian Davis Cup team, for which he recorded four singles wins and six losses.

He is the younger brother of top Austrian tennis player Jürgen Melzer (hence his nickname, Mini Melts)[4] and is the son of Rudolf Melzer, an Austrian businessman and mayor of Deutsch-Wagram, and Michaela, a saleswoman.