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British world number three Andy Murray cruised into the fourth round of the BNP Paribas Open with a straight-sets win over Taipei's Yen-Hsun Lu.

The US Open and Olympic champion broke twice in each set to win 6-3 6-2 in one hour and 28 minutes in Indian Wells.

Murray, who is on course to face world number one Novak Djokovic in the semi-finals, faces Argentina's Carlos Berlocq, ranked 85, in the last 16.

Djokovic beat Bulgarian Grigor Dimitrov 7-6 (7-4) 6-1.

Lu, who beat Murray in the first round of the Beijing Olympics in 2008, started the brighter of the two, making a series of big shots to create five break point opportunities in the first set.

However, Murray saved them all and created two of his own, sealing the set courtesy of a Lu double fault.

The opening games of the second set were closely contested before Murray broke to love in the sixth game to lead 4-2 before mopping up the next two games to clinch the match.

"It was a tough match," said Murray. "He's caused a few upsets over the last couple of years. He takes the ball extremely early, hits the ball very flat and really goes for it.

"If he's striking the ball cleanly like he was at the start he can hit a lot of winners.

"He started off well. I didn't serve particularly well to get myself into those situations, and then I served well to get myself out of some tough situations.

"In the first set he had a lot of chances on my serve. I thought my footwork in the first set wasn't great. Once I started to loosen up and relax a little bit, my footwork improved.

"He can kind of leave you flat-footed sometimes, and he certainly did that a lot in the first set. I knew it was going to be a tough encounter, so it was good to win in straight sets."

Meanwhile, Australian Open champion Djokovic overcame a slow start to defeat Dimitrov and set up a last-16 meeting with American Sam Querrey.

The Serb, unbeaten in 2013, trailed 4-1 in the opening set before battling back to sweep aside his 21-year-old Bulgarian opponent in 67 minutes.

"I just tried to stay positive and calm and hang in there and wait for the chances," said Djokovic. "So that's, I guess, the biggest positive I can take out of today's performance."

Frenchman Jo-Wilfried Tsonga booked his place in the fourth round with a straight sets win over American Mardy Fish, the 32nd seed.

Tsonga will play Milos Raonic, who beat Marin Cilic 3-6 6-4 6-3, while Juan Martin Del Potro of Argentina and German Tommy Haas both secured victories to set up a clash in the fourth round.

In the women's draw, Russian second seed Maria Sharapova eased to a 7-5 6-0 victory over Lara Arruabarrena-Vecino of Spain to set up a quarter-final with Italian sixth seed Sara Errani.

It was more comfortable for Australian Open champion Victoria Azarenka beat Urszula Radwanska of Poland 6-3 6-1.

The Belarusian will play former world number one Caroline Wozniacki after the Dane beat Nadia Petrova in straight sets.

Russian Maria Kirilenko shocked third seed Agnieszka Radwanska to set up a quarter-final with 2011 Wimbledon champion Petra Kvitova.

Australian Sam Stosur and German Angelique Kerber both secured wins to set up a last-eight tie.