体坛英语新闻：Roddick, Sharapova eliminated from Australian Open; Federer, Wozniacki, Li Na remains

MELBOURNE, Jan. 23 (Xinhua) -- Andy Roddick, Maria Sharapova crashed out on Sunday's fourth round; while Roger Federer, Novak Djokovic, Caroline Wozniacki, Francesca Schiavone and Li Na marched into the quarter-finals of Australian Open.

The last American tennis player remained in the tournament, World No. 8 Roddick crashed out of Australian Open, after being defeated by World No. 19 Switzerland's Stanislas Wawrinka in 3-6 4-6 4-6 in two hours and 22 minutes' fourth round.

Wawrinka played beautifully throughout the match, as he managed 92 percent efficiency on his first serve, and fired 24 aces in the match.

"One of my best, for sure. To beat Roddick in three sets, it's really good for me," Wawrinka told reporters in Melbourne after the match. "Yeah, I'm very happy with all my game. I was playing great and I felt I put a lot of pressure on him."

Sunday's match ends Americans'hope to claim a Grand Slam title, as Roddick was the last American remaining in the tournament.

Since winning a Grand Slam at the 2003 U.S. Open, Roddick is also the last American Grand Slam champion, the longest Grand Slam title drought for the nation.

Defending champion Roger Federer, a 16-time Grand Slam winner, made heavy work of reaching his 27th consecutive grand slam quarter-final with a 6-3 3-6 6-3 6-2 win over Spanish Tommy Robredo in the 145-minute game.

After Sunday's match, the second seed Swiss reached the quarter- final for 27 consecutive majors since his third-round exit at the 2004 French Open, equaling Jimmy Connors'record.

Of his 26 previous quarter-final appearances, Federer has converted 24 into semi-finals, gone on to reach 20 finals and won 14 of them.

However, Federer refused to single out himself and Nadal as the only title threats, as he think the top seeds in the tournament are playing extremely well.

He will face close friend and fellow Wawrinka in next game, which will be the first all-Swiss quarterfinal at a Grand Slam in the Open Era.

Third seed Novak Djokovic beat 14th seed Spanish Nicolas Almagro 6-3 6-4 6-0 to set up a last eight encounter with Thomas Berdych.

In women's draw, top seed Wozniacki defeated unseeded Latvian Anastasija Sevastova in straight sets 6-3 6-4 in the fourth round.