Reigning Australian Open champion Stanislas Wawrinka has downed Spain’s Daniel Gimeno-Traver to reach the Miami Masters third round.

The third-seeded Swiss raced through an 18-minute opening set, winning the first seven games, then lost the second set before recording a 6-0 3-6 6-3 win.

Wawrinka recovered on cue in the third with an opening break to advance in just under 90 minutes, then admitted he was still adjusting to his new status as a Grand Slam winner.

“I still have some ups and downs mentally,” Wawrinka said.

“I was negative in the second set a little bit stupidly, but then I’m really happy with the way I started the third set.

“It was important to come back strong, to move well again, to play aggressive, to push him, and to get the break early (in the third set).

“I’m happy to win. That’s the most important. It was the first one here. It’s never easy. Conditions were really slow, really humid. You need to get through. That’s it – just win the matches.”

Wawrinka fired eight aces and broke four times.

He has three wins without a loss against Gimeno-Traver after defeating the No.99 twice in 2013, both times on clay.

The Swiss, playing only his fourth ATP match since beating Rafael Nadal to capture his first major in Melbourne, improved to 14-1 for the season.

Czech seventh-seed Tomas Berdych began his Miami campaign with a 7-6 (7-5) 6-1 win over Frenchman Stephane Robert while Edouard Roger-Vasselin of France beat Croatia’s 25th seed, Marin Cilic 6-2 7-6 (7-5).

Spain’s Guillermo Garcia-Lopez defeated Gael Monfils, the 23rd seed, 6-2 7-5, with the Frenchman treated for right elbow problems on court.

German Tommy Haas, a 2013 semi-finalist, was forced out with a recurring shoulder injury before his first match.