Naomi Osaka keeps Indian Wells title defense on track

World number one and defending champion Naomi Osaka powered past American Danielle Collins 6-4, 6-2 on Monday to book a fourth-round meeting with resurgent Swiss Belinda Bencic at Indian Wells.

Japan's Osaka, whose second straight Grand Slam title at the Australian Open propelled her to the top of the rankings, traded breaks with Collins early in the first set.

But she got the decisive break in the ninth game, giving herself a break point with a backhand winner before pouncing on a short ball and belting a forehand winner to give herself a chance to serve for the set.

An increasingly confident Osaka broke Collins at love for a 2-1 lead in the second.

She finished out the next game for a 3-1 lead and led 5-1 before Collins saved a match point to hold and make Osaka serve out the match.

Collins, trying to build on a breakout run to the Australian Open semi-finals, failed in her bid to avenge her 6-1, 6-0 loss to Osaka in their only prior meeting in Beijing last year.