Serena surges into Australian Open semi-final against Radwanska

Melbourne (AFP) - World number one Serena Williams muscled past Maria Sharapova for an 18th straight time Tuesday to set up an Australian Open semi-final against Agnieszka Radwanska, who has never beaten the dominant American.

The six-time Melbourne Park champion heaped more misery on her long-time rival 6-4, 6-1, with the Russian fifth seed stretching her demoralising unbeaten run against the American great to 12 years.

With Sharapova again swatted aside, the 34-year-old Williams, gunning to match Steffi Graf's Open-era Grand Slam record of 22 titles, now has the composed Pole in her sights.

The signs are not good for Radwanska, who easily disposed of Spanish 10th seed Carla Suarez 6-1, 6-3 win on Rod Laver Arena.

While her record against Williams is not yet on the scale of Sharapova, it is still dismal.

She has played her eight times since 2008 and lost the lot, taking just one set along the way.

Poland's Agnieszka Radwanska hits a return during her Australian Open match against Spain's  …

Another ominous fact facing the Pole is that every time defending champion Williams has got past the quarter-finals at Melbourne Park, she has gone on to win the tournament.

Ahead of the Williams-Sharapova showdown, Radwanska, also a semi-finalist last year, said she did not mind who she faced in the last four clash on Thursday.

"I have nothing to lose and it does not matter who I play. Hopefully I can play my best tennis or I'll be in trouble," said the popular 26-year-old, who is on a 13-match win streak.

The Pole added that the experience she gained from making the Wimbledon final in 2012 and three other major semis would be crucial.

"Experience is very important in tennis. I'm happy to have that and I'll be ready for the semi," she said.

Russia's Maria Sharapova plays a forehand return during her women's singles match against Se …

Her big-match experience pales in comparison to Williams who has won 21 Grand Slam titles, including six at Melbourne Park, and played in four other finals at the majors.

"She a great defender and a great girl," Williams said of Radwanska. "Regardless, whoever gets to the final it will be a great thing. I have nothing to lose."

- 'Back to the drawing board' -

On a scorching hot day, the sluggish 34-year-old, the oldest world number one in WTA history, was slow to get going against Sharapova.

She was broken on her opening serve but soon got on the scoreboard as her power serve found its range and her game started coming together.

Serena Williams (R) shakes hands with Maria Sharapova after winning their women's singles match  …

It was a typically tight first set against her long-time rival but she finally came through after a brutal 55 minutes.

Williams, who only lost three matches in 56 last season, called the trainer out at the changeover, apparently feeling unwell, but soldiered on and took control with an early break in the second set.

The Russian began wilting and Williams, who won three majors -- the Australian and French Opens and Wimbledon -- last year, which took her to within one of Graf's record of 22, kept her foot to the floor and turned the contest into a rout.

It meant the five-time Grand Slam winner's demoralising jinx against one of the greatest players ever remains intact.

It dates back to 2004 when she last beat her in the Wimbledon final. Her downfall started in an epic semi-final at the 2005 Australian Open, with the American scraping home in a 2-6, 7-5, 8-6 thriller.

Despite yet another defeat, Sharapova insisted it kept her motivated to keep improving.

"It's motivating because she's at a different level. She makes you go back to the drawing board, not just for me, but for many other players," she said.