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Alongside German doubles partner Jan-Lennard Struff, he beat Wesley Koolhof and Kiwi Marcus Daniell 7-6 7-6 in yesterday's quarterfinal.
It was a tight game, both sets going to a tiebreaker.
Indeed only five points - which could be accounted for in the two tiebreakers - separated the pairings over the entire match.
The duo will now play Mate Pavic and Oliver Marach - ranked third and fourth in the world respectively - in tonight's late game.
In the other semifinal Kiwi Michael Venus and partner Raven Klaasen face Bob and Mike Bryan.