Melbourne, Jan 25 (Agencies): China’s Li Na stormed into semifinals of the Australian Open for the second consecutive year beating Andrea Petkovic 6-2, 6-4.

The No. 9-seeded Li broke her German rival's serve three times in the first set and twice in the second, recovering an early break in each set and playing more consistently than Petkovic.

Li lost the 2010 semifinal in two tiebreak sets to eventual champion Serena Williams.

"It's good for me-second time in a Grand Slam semifinal always in Australian Open," Li said. "Hopefully I can do better in this year. I don't want to lose in semis again."

The 28-year-old Li was the only quarterfinalist from the last Australian Open to reach the last eight this year.

She has extended her winning streak to 10 matches this year, including her title run at the tuneup tournament in Sydney, where she became the first Chinese player to win a WTA Premier singles title.

Rafael Nadal is on a 25-match winning streak in Grand Slam tournaments and is focusing on his "Rafa Slam" right now. He was more comfortable talking about his 6-2, 6-4, 6-3 fourth-round win over Marin Cilic on Monday night than his modeling work for Armani.

Nadal already holds the French, Wimbledon and U.S. Open crowns and is three wins from an Australian title. Nobody has held all four men's majors at once since Rod Laver in a calendar year in 1969.

He next plays fellow Spaniard David Ferrer, who fended off big-serving 20-year-old Canadian qualifier Milos Raonic 4-6, 6-2, 6-3, 6-4.