Andy Murray reached the quarterfinals of the Monte Carlo Masters after Julien Benneteau injured his ankle Thursday and retired near the end of a hard-fought first set with the score 6-5.
Benneteau, a former French Open quarterfinalist, gave the third-seeded Murray problems throughout a set in which both players were aggressive.
The Frenchman dictated many of the rallies, troubling Murray with some big forehands and driving him back with some stinging backhands.
But Benneteau, scampering to retrieve a shot from the baseline, slipped and rolled his right ankle. He also hurt his right wrist trying to break his fall.
Benneteau received lengthy treatment and continued briefly before retiring.
Murray next pays sixth-seeded Tomas Berdych of the Czech Republic, who recovered from a shaky first set to beat No. 12 Kei Nishikori of Japan 2-6, 6-2, 6-4.
Nishikori lost only two points on his serve in the first set and broke Berdych twice.
Murray, meanwhile, struggled to hold his opening s...