Dubai, UAE  - World number one Serena Williams withdrew with a right knee injury before a Saturday Paris semi-final but said she hopes to be fit for next week's appearance in Dubai.

The Australian Open champion was to have faced Russian Elena Dementieva at the GDF tournament in Paris. But Williams said she felt something in her knee and withdrew as a precaution.

"I didn't feel well during the warm-up this morning, my knee hurt," said the American. "I'm extremely disappointed."

Williams said the first noticed the problem during her Friday quarter-final win over Emilie Loit.

London, Feb 10 : A four-year-old tennis prodigy named Mia Lines is being trained by none other than the man who has coached the champion sisters Serena and Venus Williams.

Mia, who began playing the game at the mere age of one, is a God gifted player, according the world-renowned coach Rick Macci.

"I have seen hundreds of kids come through my school in the 25 years I have been doing this and I have never seen a four year old with such god-given talent," the Telegraph quoted Rick as saying.

Hamburg - American Serena Williams remains top of a virtually unchanged women's tennis rankings issued Monday by the WTA ruling body.

Williams, who beat Dinara Safina in the final of the Australian Open on January 31 to take top spot, heads the rankings with 9,432 points followed by the Russian on 9,150 points.

Serbian Jelena Jankovic, who topped the rankings ahead of the Australian Open, remains third, with Russia's Elena Dementieva fourth.

The only change in the Top Ten sees Nadia Petrova of Russia leapfrog Poland's Agnieszka Radwanska into ninth place.

Hamburg  - American Serena Williams has regained the women's world number one tennis ranking after beating Dinara Safina in two sets in the final of the Australian Open on Saturday.

Williams heads the rankings published by the ruling body WTA on Monday by 282 points from Safina. Williams has 9,432 points, while the Russian stands on 9,150 points.

Serbian Jelena Jankovic, who topped the rankings ahead of the Australian Open, slipped to third, with Nadia Petrova the only newcomer into the top ten.

The Russian is tenth with 3,882 points.

Melbourne, Jan. 31 : American Serena Williams on Saturday won her tenth Grand Slam title by winning this year''s Australian Open.

Williams, 27, overwhelmed Russian Dinara Safina 6-0 6-3 in 59 minutes to regain the world No. 1 ranking and become just the seventh woman in history to accrue 10 grand slam titles.

In edging past Monica Seles, Williams now trails only Australian legend Margaret Smith Court (24), Steffi Graf (22), Helen Wills Moody

Melbourne - Serena Williams of the United States routed Russia's Dinara Safina 6-0, 6-3 on Saturday for the Australian Open title and a return to the top of the women's tennis rankings.

Williams, 27, stretched her Melbourne success run to four titles after earlier wins in 2003, 2005 and 2007. Her 10th Grand Slam singles title came a day after she lifted the doubles crown with her sister Venus Williams.