Nadal coped well with the blustery conditions in California
Rafael Nadal made a comfortable start to the defence of his Pacific Life Open title with a straight-sets win over Colombian qualifier Santiago Giraldo.
The Spaniard, seeded two, won 6-3 6-3 in difficult windy conditions to move into round three.
Novak Djokovic, last year's runner-up, also started solidly, beating Italian Andreas Seppi 6-3 7-6 (7-3).
In the doubles, Jamie Murray and Max Myrni defeated Ivan Ljubicic and Tommy Robredo 6-4 7-6 (7-3).
They were joined in the next round by Andy Murray, Jamie's brother, and Eric Butorac, who defeated Martin Damm and Pavel Vizner 7-5 6-3.
Both Nadal and Djokovic were relieved to get through as the blustery desert winds made life difficult for all the players.
"Today I win. That's it. I can't do too much," said Nadal.
And Australian Open winner Djokovic echoed those comments, saying: "I won. That's all that matters."
Djokovic will play Germany's Philipp Kohlschreiber in round three, while Nadal will take on America's Donald Young.
Andy Murray gets his singles game under way on Sunday, against Austrian Jurgen Melzer, while top seed Roger Federer plays Guillermo Garcia-Lopez of Spain.
In the women's event, Ana Ivanovic admitted she allowed the conditions to distract her as she suffered a scare before beating Romanian Ioana Raluca Olaru 6-1 5-7 6-0.
"I was really upset when she broke me back on 3-2 in the second set, and I just struggled to find my game little bit," Ivanovic said.
"I wasn't moving enough and when it's windy day we really have to focus on footwork and moving the feet, and going around the ball, and I didn't do that well."
Elsewhere, Serbia's world number four Jelena Jankovic and twice champion Lindsay Davenport cruised through their opening matches.
Shrugging off the gusting winds, Jankovic crushed American wildcard Ahsha Rolle 6-0 6-2, while Davenport advanced when Argentina's Gisela Dulko retired hurt with a thigh strain trailing 2-6.
Davenport will play Taiwan's Chan Yung-Jan, who shocked 11th seed Sybille Bammer 6-1 6-3.
But the day's biggest casualty was seventh seed Nicole Vaidisova of the Czech Republic who lost in the final match of the day to Australian Casey Dellacqua 6-1 3-6 6-4.
Qualifier Evgeniya Rodina upset 16th-seeded Virginie Razzano 6-0 6-7 6-2 and another Russian-French pairing saw 12th seed Vera Zvonareva edge past Aravane Rezai 6-3 3-6 6-3.