Cilic, who reached his first semifinal at Roland Garros on Wednesday, joined the esteemed group that includes Rafael Nadal, Novak Djokovic, Roger Federer, and Andy Murray, dug deep to seal a 5-7, 6-3, 6-4, 3-6, 7-6(10-2) victory and reach the last-four stage at the clay-court Grand Slam.