INDIAN WELLS, California (AP) ― Defending champion Roger Federer beat Ivan Dodig of Croatia 6-3, 6-1 in a third-round match at the BNP Paribas Open on Monday, with the Swiss star tweaking his back near the end of the match.

Federer earned his 890th career ATP Tour victory, joining Jimmy Connors, Ivan Lendl and Guillermo Vilas as the only men to have won at least that many matches in the Open era. The second-ranked Federer is seeking his first tournament title of the year at an event where he has won four championships and has a 41-8 career record.

Federer was the highest-seeded men’s player in action Monday. He has Tuesday off to give his back a rest.

“I’m not too worried. I have gone through it so many times where you feel a little tweak,” he said. “Happened during Grand Slams, during tournaments, in practice. It’s just something you learn to deal with.”

Top-ranked and defending women’s champion Victoria Azarenka rallied to beat 28th-seeded Kirsten Flipkens of Belgium, 3-6, 6-3, 6-0 and improve to 15-0 this year. Azarenka’s pal, musician Redfoo of LMFAO, cheered her on.

A 4.7 magnitude earthquake struck at 9:55 a.m. near Indian Wells. It occurred before the day’s matches had begun, although the Indian Wells Tennis Garden was busy with fans and workers, many of whom said they felt a strong jolt.

Federer ran out of the house where he’s staying.

“I didn’t know how long it was going to last, if it was going to get worse from there, or if the worst was already past,” he said. “It was a very strange feeling to have because you see the windows shaking and you look up and realize you’re under a structure. It was quite scary for a second there.”

Fifth-seeded Rafael Nadal was on the massage table preparing for his match against Leonardo Mayer of Argentina when the quake hit.

“I was very scared,” he said. “I think the massage table moves even worse.”

The Spaniard said his legs were wobbling and even though it was his first earthquake it took him “probably a half-second” to realize what was happening.

After the excitement caused by the quake, Nadal didn’t even get to play his match. Mayer withdrew because of a back injury.

Nadal opened his bid for a third Indian Wells title with a two-set victory over American Ryan Harrison on Saturday, the Spaniard’s first hard-court match in nearly a year. He returned to the ATP Tour a month ago, winning two of three tournaments on clay after missing seven months because of a left knee injury.

Temperatures are forecast to soar in the next few days, conditions that should favor Nadal.

“For me, for my knee, for my foot, for everything is better when the conditions are warmer,” he said. “I love practicing and playing in days like today: no wind, fantastic weather, good, hot temperature.”

Nadal shared a friendly hit on Sunday with tournament owner Larry Ellison, the co-founder and CEO of Oracle Corp. and one of the world’s wealthiest men.