Sloane Stephens reached the quarter-finals of the French Open on Sunday after a straight-sets win over former champion Garbine Muguruza. Stephens, the beaten finalist last year needed just over an hour and a half to defeat the Spaniard 6-4, 6-3 and set up a last-eight clash with Johanna Konta. Despite her eventual defeat, it was Muguruza who started the match stronger and she had chances to take a 3-0 lead with a double break in the first set, which Stephens saw off. Muguruza tightened up her game in the second set but unforced errors cost her when she was serving at 3-4, giving Stephens the chance to serve it out. Stephens, the 2017 US Open champion, squandered her first four match points but when Muguruza sent a return into the net on the fifth, the 26-year-oldвЂ™s quarter-final spot was confirmed. "I'm trying to hit a lot more forehands. So far, so good, it's worked out well," Stephens told Eurosport after the match. "It's always tough when you're closing out a match. Garbine is such a good competitor. She'll fight until the end. I had to make sure I stayed steady on that last game. I was pleased to get through."