Rafael Nadal breezes into Round 4

KEY BISCAYNE, Fla. -- Rafael Nadal received a warning for slow play Monday and still won in 59 minutes against Denis Istomin, 6-1, 6-0, in the third round of the Sony Open.

No. 10 seed John Isner, the only American to reach the men's third round, hit 17 aces and beat Nicolas Almagro 7-5, 6-3.

The lack of upsets so far means players with a total of 66 Grand Slam titles will be in action Tuesday, including Nadal, Roger Federer, Novak Djokovic Maria Sharapova and Serena Williams.

No. 22-seeded Alexandr Dolgopolov rallied from a break down in the final set to beat Dusan Lajovic 3-6, 6-0, 7-6 (5). Dolgopolov has gone 6-1 this month despite his worries about unrest in his native Ukraine, where his mother and other relatives still live.

"For me it was important it has calmed down and no people are dying," said Dolgopolov, who was born in Kiev. "But there's a little bit of chaos still going on, and no one knows who is the ruling party and who is controlling the country. It's a mess."

Information from The Associated Press was used in this report.