Denis no menace for Nadal

Rafael Nadal dropped just one game as he brushed aside the challenge of Denis Istomin in under an hour to reach the last 16 of the Sony Open in Miami.

The Spaniard - looking to win a tournament that has so far eluded him during his illustrious career - was at his ruthless best as he dismissed his rival from Uzbekistan in a real hurry.

He converted six of the seven break-point chances he created while Istomin didn't help his own cause by committing no fewer than 22 unforced errors.

The 6-1 6-0 result for Nadal follows on from a straight-sets win over Australian Lleyton Hewitt in the previous round, proving the world number one's early exit in Indian Wells last time out was just a temporary blip.

He will next face Italy's Fabio Fognini who had to dig deep to beat Roberto Bautista Agut 4-6 6-3 6-3.

Wawrinka through

Stanislas Wawrinka also progressed at Crandon Park with a 7-5 6-4 victory over Edouard Roger-Vasselin.

The third-seeded Swiss, who has never before reached the quarter-finals of the Masters Series event, overcame his French opponent after one hour and 34 minutes on court.

However Wawrinka didn't have things all his own way against Roger-Vasselin, who missed opportunities to get the first break in the opening set before eventually losing his own serve in the 12th game.

The second set saw the reigning Australian Open champion ease out to a 4-1 lead, only for Roger-Vasselin to draw level by winning the next three games in a row.

Wawrinka, though, recorded a third break to move 5-4 ahead and then duly sealed the win in style, lashing a forehand winner to register his 15th success in his last 16 outings.

He will next face Alexandr Dolgopolov, the Ukrainian having rallied from a set behind and then a break down in the decider against Dusan Lajovic to win a see-saw contest 3-6 6-0 7-6 (7/5).

In contrast, Canadian 12th seed Milos Raonic eased into the last 16 with 6-1 6-2 win over Spain's Guillermo Garcia-Lopez in a match that lasted 56 minutes.