Kevin Anderson made the final at Queen's Club by beating Gilles Simon of France 6-3, 6-7 (6), 6-3 on Saturday.
The unseeded South African struck his 34th ace to seal victory, bringing his total of aces in the tournament to 96.
Anderson will appear in his second final of the year on Sunday after winning his 12th career title in Marseille in February.
Andy Murray and Viktor Troicki met in the second semi on Saturday.
Just one break of serve decided the opening set as Anderson took a 5-3 lead, and he had the opportunity to further his advantage early in the second set when he held four break points to lead 1-0.
The seventh-seeded Simon fought off the challenge but still found his back against the wall when Anderson served for the match at 5-4, and held a match point at 6-5 in the tiebreaker.
Although Simon won the next three points to level the set score, Anderson made the next vital break at 4-3 in the third set, and closed it on his third match point.