Novak Djokovic survived a massive scare during his third round match at the Western & Southern Open against David Goffin, before claiming a 6-4, 2-6, 6-3 victory over the Belgian player.
Djokovic is aiming to become the first man to win all eight Masters 1000 titles, but found himself on the verge of defeat when he went two breaks of serve down in the deciding set, having surprisingly lost his serve three times during a lacklustre second set from the world number one.
After destroying one of his racquets in anger, the Serb regained his composure to level matters in the third set at 3-3, before winning the next three games and with that, the match.
"It was a solid first set, but whatever happened in the next 45 minutes I don't want to remember it," Djokovic said, referring to a period of the match in which he served seven double faults which contributed significantly to the five breaks of serve he suffered.
"Luckily for me I managed to bounce back, dig myself out of this hole I was in," added Djokovic, who admitted he had struggled to adjust to the conditions.
"Very swirly on the court. Not easy to serve or easy to control the ball, it flies through the air very quickly."
In the quarter-finals, the Australian Open and Wimbledon champion will take on the man who defeated him in the final of the French Open, Stanislas Wawrinka.
Wawrinka spent more than two-and-a-half hours on court against big-serving Ivo Karlovic, eventually coming through 6-7 (2), 7-6 (5), 7-6 (5) in a match which didn’t contain a single break of serve.
"I'm really happy to get the win, you know what to expect from him," said Wawrinka after Karlovic served 35 aces in the match.
"I'm happy with the way I stayed positive with body language, and always made him play one more ball. You must accept that he will have a lot of aces. I'm happy to get through."
Sixth seed Tomas Berdych also advanced after he crushed Spain's Tommy Robredo 6-0, 6-1, while Alexandr Dolgopolov beat Pole Jerzy Janowicz 6-3, 3-6, 6-4 in an earlier third round match.