Second-ranked Nadal will take on unseeded Santiago Giraldo of Colombia. Giraldo beat Dmitry Tursunov of Russia 6-4, 7-6 (4).

"I was happy with almost everything today," Nadal said. "I was focused with my serves without mistakes. I lost very few points on my serve in the last set."

In other matches, second-seeded Andy Murray of Britain overwhelmed American Alex Bogomolov Jr. 6-1, 6-2. Murray will face David Nalbandian in the quarterfinals, after the Argentine beat Ivan Dodig of Croatia 7-6 (2), 6-2.

David Ferrer of Spain advanced with a 4-6, 6-2, 6-2 victory over Australian qualifier Matthew Ebden.

Trailing 6-5 and serving at 30-30 in the 12th game of the first set, Raonic double-faulted to hand Nadal set point. The Canadian then hit a forehand long to give the Spaniard the set.

In the second set, Nadal broke the big-serving Raonic in the sixth game to go up 4-2, then stayed on serve and closed out the contest in 1 hour, 30 minutes.

Nadal, the defending champion, got in 77 percent of his first serves in the victory and Raonic was not able to gain a single break point against the 10-time Grand Slam champion.

Raonic's powerful forehand was impressive, but he committed several unforced errors.

"The top players do a few things better than the others," Nadal said. "The matches are decided by very few points. It is on these points where the top players play better."