Rafael Nadal lost a set at the French Open for the first time in three years as Argentinian Diego Schwartzman claimed a surprise 6-4 lead in their quarter-final clash on Wednesday. For Nadal, that happened when he was down a break at 3-2 in the second set, and the delay of a little less than an hour seemed to help him begin to change course against Schwartzman, a 1.7 metre Argentine who was putting almost every shot right where he wanted to in the early stages. As he took his position to serve for his third set point, he turned around and saw a spectator struggling in the stands and immediately moved to the support staff and asked them to get the person some medical assistance.
Marterer may have felt he would need a degree of fortune to have any chance of an upset and the early signs were promising as a net cord set up two break points, Nadal double faulting on the first to hand his opponent a 2-0 lead.
Nadal, returning with his famed forehand finally firing on all cylinders, earned back-to-back breaks to move within a hold of the set.
The Spaniard, who won five straight games after a rain delay to beat Alexander Zverev in the Rome Masters final last month, managed three in a row this time before play was ended for the day.More news: In Miami, protesters seek end to separation of immigrant parents, kids
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Kasatkina will face US Open victor Sloane Stephens for a place in the semifinals.
Schwartzman took the opener 6-4, ending Nadal's streak of winning 37 consecutive completed sets at the clay-court major. And previous year, he earned the trophy without dropping a set.
Two-time runner-up Halep came back from a set down for the second time in the tournament to see off 12th seed Kerber, who was bidding to become the first German woman in the last-four since Steffi Graf in 1999.
Sharapova made 27 unforced errors, was broken six times and served six double faults in only her fifth loss from 25 Grand Slam quarter-finals.