Defending champ Stan Wawrinka reaches Australian Open 4th round

Melbourne: Defending champion Stan Wawrinka used service breaks to clinch all three sets on his way to a 6-4, 6-2, 6-4 win over Jarkko Nieminen in a third-round match on Saturday at the Australian Open.

Wawrinka won his first career Grand Slam singles title last year at Melbourne Park, beating Rafael Nadal in the final. Later in the year, he and Roger Federer led Switzerland to its first Davis Cup triumph.

Nieminen hadn't advanced to the third round here since a quarterfinal appearance in 2008.

In the fourth round, Wawrinka will play either Guillermo Garcia-Lopez of Spain or Canada's Vasek Pospisil.