Serena Williams defeated Victoria Azarenka 7-5, 6-3 in a battle of former world No 1s on Friday to reach the sthird round at Indian Wells.
Williams, seeded 10th in her first tournament since a quarter-final exit at the Australian Open, needed two hours and seven minutes to get past her longtime rival.
She took her record against Azarenka to 18-4, although the Belarusian, now ranked 48th in the world, had triumphed in their most recent prior meeting in the 2016 final on the same Indian Wells stadium court.
"It's hard to play somebody you're so close to," Williams said. "It's also invigorating."
Williams advanced to a third-round meeting with another former world No 1, Spain's Garbine Muguruza, who beat American Lauren Davis 6-1, 6-3.
Wawrinka through
Three-time grand slam champion Stan Wawrinka made a triumphant return to Indian Wells on Friday, rallying for 6-7, 6-3, 6-3 victory over British qualifier Dan Evans to reach the second round.
It was a rematch of Wawrinka's four-hour, five-set victory over Evans in the third round of the 2016 US Open - where the Swiss would go on to claim his third grand slam crown.
"He's always a tough player to play, for sure," Wawrinka said. "He's mixing a lot, especially on conditions like today when it's windy. With his slice, he feels the ball really well. He's mixing his game, serve and volley, sometimes coming, sometimes not, passing well.
"So I'm happy to get through a match like today," he added.
Wawrinka, on the rise after 18 months battling injury and recovering from double knee surgery, was runner-up in the California desert in 2017, but missed the combined ATP Masters and WTA event last year.
While top seeds led by world No 1 Novak Djokovic enjoyed first-round byes, 40th-ranked Wawrinka gutted out a two-hour, eight-minute clash with 100th ranked Evans.
Wawrinka saved all six break points he faced in the deciding set, battling back from 0-40 down in the fifth game and pushing to a 5-3 lead.
He held at love to line up a second-round meeting with 29th-seeded Hungarian Marton Fucsovics.
"I think for me this year it's for sure special because I'm happy to be back," said Wawrinka, whose run to the final in Rotterdam last month was his first final since Roland Garros in June of 2017.
He has not lifted a trophy since Geneva in May of 2017, but says his Rotterdam run put his comeback in a new phase.
"It helped me a lot to put away a little bit of pressure of knowing that you play well but [are] not winning too many matches," Wawrinka said.
Injured Anderson withdraws
Fifth-seeded South African Kevin Anderson's challenge ended before it began as he withdrew from the tournament with a right elbow injury that has nagged him since a second-round exit at the Australian Open.
In other first-round matches, German Peter Gojowczyk defeated Italian Andreas Seppi 7-5, 6-4 to set up a second-round meeting with fourth-seeded Roger Federer, who is coming off a remarkable 100th career title in Dubai.
Australian qualifier Alexei Popyrin beat Spain's Jaume Munar 7-6, 6-3 to advance to a meeting with eighth-seeded American John Isner and Aussie qualifier Alex Bolt also advanced with a 6-3, 5-7, 6-2 victory over Ernests Gulbis.
Popyrin, 19 and ranked 131 in the world, notched his first win in a Masters 1000 event and will now try to take out his second top 10 opponent this year after beating Dominic Thiem at the Australian Open.
American Jared Donaldson defeated Japan's Tatsuma Ito 6-3, 7-5 to set a second-round showdown with second-seeded Rafael Nadal. France's Adrian Mannarino will take on sixth-seeded Kei Nishikori after beating American Tennys Sandgren 6-2, 6-7, 6-1.
