Gerald Melzer has primarily spent his time on the Futures circuit, while also playing Challengers and several doubles events with his brother. He began playing on the tour in 2007, competing in tournaments in Austria as well as Futures tournaments in Africa. In 2008, he has had more success playing doubles, partnering with his brother to win a challenger in
Graz, Austria. In 2015, as a qualifier, Gerald reached the semifinals of
Munich. He faced his brother, Jürgen, in the first round of the
2015 Wimbledon qualifying tournament, and lost in straight sets. Jürgen described it as the "worst tennis day of my life and I hope we will never play each other again." At the
2017 Australian Open, Melzer lost in the first round to Australian
Alex de Minaur in five sets. He held a match point in the fourth set, but was unable to close it out. ==Personal information==