Wimbledon 2017: Rafael Nadal beats Karen Khachanov to reach last 16

Two-time champion Rafael Nadal is through to the last 16 of Wimbledon with a straight-set win over Russia's Karen Khachanov.

Spanish fourth seed Nadal took the first set in just 21 minutes and eventually won 6-1 6-4 7-6 (7-3) on Centre Court.

Ninth seed Kei Nishikori is out after the Japanese lost in four sets to Spain's Roberto Bautista Agut.

Marin Cilic is also through after comfortably beating Steve Johnson.

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For a while I played fantastically - Nadal

Nadal broke the 21-year-old Khachanov's serve three times in the first set as he completely dominated his opponent.

The second set was a tighter affair, with Khachanov finally holding his serve but still being broken in the third game.

Nadal had to save a set point in the third to force a tie-break, but the French Open champion triumphed in two hours and 14 minutes.

Victory means Nadal has not dropped a set in his past 10 Grand Slam matches, winning 28 completed sets in a row.

If he reaches the final then he will return to the top of the world rankings for the first time since June 2014.

"For a while I played fantastically," Nadal told the BBC. "The first set and a half was a great, great level - then it was a little bit tougher.

"I'm happy about almost everything."

The 31-year-old will play Luxembourg's Gilles Muller in the fourth round, who earlier beat Britain's Aljaz Bedene.

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Nishikori lost 4-6 6-7 (3-7) 6-3 3-6 to 18th seed Bautista Agut in three hours and 21 minutes on court three.

Bautista Agut has never gone beyond the fourth round at a Grand Slam, while Nishikori is yet to go beyond the last 16 at Wimbledon.

Croatia's seventh seed Cilic, who beat American Johnson 6-4 7-6 (7-3) 6-4, will face Bautista Agut in round four.

Play was suspended for bad light on court two with American Sam Querrey leading 12th seed Jo-Wilfried Tsonga of France 6-5 on serve in the fifth set.