He was given a wildcard, but lost to the top seed, Jo-Wilfried Tsongain three tough sets. He then lost to 19th seed Kevin Anderson in straight sets.
Roger Federer faces Denis Kudla, a qualifier who has yet to drop a set in Halle, as he bids for a place in the Gerry Weber Open final for the twelfth time.
Federer won the first set in a tie break, but had to come back from down in the second set, having lost his serve twice before eventually winning 2 , By the standards of Federer, who has won nine Gerry Weber Open titles in Halle between and , this counts as having to overcome a serious challenge and mount a major comeback.
Federer still has a job to do in Halle, and his next opponent is a man on some pretty impressive form in qualifier Denis Kudla.
But grass has always been a good surface for Kudla, who won the Ilkley Challenger on the surface in June and was also runner-up in the Surbiton Challenger.
Kudla has already made two Challenger finals winning one of them and a semifinal in , and made the second rounds of both the Australian Open and Houston after qualifying for the main draw.
A first-round loser at the French Open after qualifying for the main draw, Kudla has clearly been playing some good tennis on grass again in even before Halle: He narrowly lost to Jeremy Chardy in a third-set tie break in the quarterfinals of the Surbiton Challenger, and qualified for the main draw at the Mercedes Cup in Stuttgart last year before losing to Marton Fucsovics in the first round.
He has never won one, although he did lead Dominic Thiem by two sets at the Australian Open this year before falling in five and also succeeded in taking a set from Marin Cilic on grass at Wimbledon in The solitary meeting between Federer and Kudla took place all of six years ago at Indian Wells, when Federer won , A fairly tight first set and a dominant second would be the way you would expect this match to play out, with a victory for Federer putting him into the Halle final for the twelfth time.
Federer vs Kudla semifinal tennis is live from Halle on Saturday at