Andy Murray following United Kingdom election debates in Paris

The eighth-seeded Nishikori was leading 7-5, 6-4, 6-7 (4), 0-3 when rain stopped play Saturday, but was clearly struggling with a wrist injury and had also had treatment on his back as the 21-year-old Chung rallied. "I moved a lot better after that first set".

"Mentally I feel pretty good just now", Murray said "After each round, I'm not thinking about winning".

Murray spoiled del Potro's 100th Grand Slam match, firing 44 winners and converting six of 17 break chances.

Murray faced the Argentine in last summer's Olympic final in Rio, with the tie on that magical occasion going to four sets before the Brit eventually clinched gold to retain his title.

The world number one, who beat Del Potro in the Rio Olympic final, needed almost three hours to beat the 29th seed, and Murray made an effort to contain his trademark swearing and futile shouting, after admitting he had let his emotions get the better of him in the previous round. After Murray converted a third set point of his own when his opponent's big forehand landed barely wide, del Potro rested his head on the net and stayed put for several seconds, the very picture of disappointment.

After fighting back from two sets to one down to beat Diego Schwartzman in the third round, the defending champion was no doubt hoping for an easier evening.

Wawrinka also endured a tiebreak in the opening set against Fabio Fognini, where he set at 7-2, before regrouping himself to win 6-0, 6-2 in two sets to follow. This was their 10th meeting (the first since that epic Davis Cup match in Glasgow) and 6th win for Andy who will now face John Isner or Karen Khachanov.It was the closest possible battle in the opening two sets and Andy managed to win both, leaving his rival with nothing more in the tank in the final set.

Halep had lost her previous four clay-court matches against Suarez Navarro, including in the first round at Roland Garros in 2013.

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Andy Murray says he feels in a good place as he prepares to take on Karen Khachanov in the fourth round of the French Open.

Next up for Djokovic is No. 6 Dominic Thiem of Austria - the player he beat in last year's semifinal in three sets, dropping just seven games. Del Potro, playing in his first French Open since 2012, was hoping to keep improving his form after injuries early in the air.

Unfortunately, though, Kyle Edmund narrowly missed out on making this the most successful Roland Garros for British men since 1963 when he was beaten in five sets by South African Kevin Anderson.

Spanish veteran Fernando Verdasco continued his impressive run through the field taking down another seed.

Defending champion Garbine Muguruza and French favorite Kristina Mladenovic are heading to a third set at Court Suzanne Lenglen with a Roland Garros quarterfinal spot at stake.

Garcia, seeded 28, made the 4th round of a Slam for the first time with a 6-4, 4-6, 9-7 win over Taiwan's world number 109 Hsieh Su-Wei.

World No 1 Andy Murray and 2009 US Open champion Juan Martin del Potro square off in the latest chapter of a thrilling rivalry. I have been out for a long time. "We will try to give them a good show, a good game".

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