Andy Murray had to dig deep as he rallied to beat Richard Gasquet 4-6 6-1 6-4 at the Western and Southern Open on Friday.
Murray produced a gutsy display to outlast Grigor Dimitrov in the last 16 on Thursday, after saving a match point and overturning deficits in the second and third sets.
The world number two Murray appeared fatigued following his heroics the day prior, though he eventually found his rhythm as he came from a set down against Frenchman Gasquet to reach the semi-finals after two hours, six minutes in Cincinnati.
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Rogers Cup champion Murray now boasts a 56-8 win-loss record this season. No player has more wins on the ATP tour in 2015.
Murray's struggles were evident in the opening set, with the two-time grand slam winner tallying 13 unforced errors compared to just five from Gasquet, who broke at 4-4 before serving it out.
The Briton stepped it up a gear in the second, winning two of four break point opportunities to send the contest to a deciding set.
And Murray was not to be denied from that point on, with Gasquet double-faulting at 4-4 to gift the former the crucial break and ultimately the match.
Standing in the way of Murray and back-to-back finals appearances following last week's win in Montreal is Swiss second seed Roger Federer.
Defending champion Federer downed Feliciano Lopez 6-3 6-4.
Federer - bidding to win a seventh Western and Southern Open title - holds a 12-0 head-to-head record against the Spaniard.
Ukrainian qualifier Alexandr Dolgopolov also advanced to the semis on Friday.
Dolgopolov, who replaced injured Kei Nishikori in the main draw, upstaged sixth seed Tomas Berdych 6-4 6-2.
After converting two of five break points, Dolgopolov will face world number one Novak Djokovic for a spot in the final.
Djokovic - bidding to claim a career sweep of the World Masters titles - easily accounted for rival Stan Wawrinka 6-4 6-1.