MELBOURNE, Australia — Stanislas Wawrinka backed up his upset of four-time champion Novak Djokovic by reaching his first Grand Slam final with a 6-3, 7-6 (1), 6-7 (3), 7-6 (4) win over Tomas Berdych in the Australian Open semifinals on Thursday.

Wawrinka ended a 14-match losing streak against Djokovic with a dramatic five-set, four-hour win in the quarterfinals, then followed that with a dominating performance against Berdych, the 2010 Wimbledon finalist.

“I don’t know what to say. I’m speechless,” he said. “I didn’t expect to make a final in a Grand Slam — tonight it’s happening.”

Wawrinka will meet the winner of Friday’s semifinal showdown between Rafael Nadal and Roger Federer, the 33rd installment of their rivalry and the first at a Grand Slam since Nadal knocked Federer out of the Australian Open at the same stage in 2012.

Whoever he plays, Wawrinka will go into the final as an underdog. He has never won against Nadal in 12 meetings, and he has lost all but one of his 14 matches against his countryman, Federer.