Serena Williams

Serena Williams Tennis star Serena Williams underwent emergency treatment for a blood clot in her lungs on Monday, and was recovering Wednesday at Cedars Hospital in Los Angeles, according to People Magazine.

Nicole Chabot, a Williams spokeswoman, said the 29-year-old tennis champion “underwent emergency treatment for a hematoma suffered as a result of treatment for a more critical situation. Last week, Serena suffered from a pulmonary embolism which was discovered upon her return to L.A. She had been in New York for doctor appointments for the ongoing issues with her foot.

Williams has not played a match since winning Wimbledon last July 3. She said she cut her right foot on glass at a restaurant in Germany in the days after Wimbledon, and has since had complications related to the injury and two surgeries one in July and one in October

Serena Williams, the former world no.1 American player, who was out of action due to an foot injury is aiming for a return in the French Open 2011 which is scheduled to be held later in the month of May. Williams, 29, hasn’t played a WTA Tour match since winning Wimbledon last July, and her ranking has dropped to No. 11.

Serena Williams had her walking boot taken off in the past few weeks and hopes to be back on the practice court soon. She has already been withdrawn from the Nike Clash of Champions exhibition which is being held at Matthew Knight Arena in Eugene, Oreland on March 8, 2011.

If Serena Williams, who is presently ranked No. 11, might not get into action until Roland Garros, she will be seeing her ranking drop somewhere out of the top 17, as she is shielding points at Rome and Madrid.

She was hoping to return to training in recent weeks, and remains on the entry list for the Sony Ericsson Open in Key Biscayne, set for March 22 to April 3, but tournament director Adam Barrett said he doesn’t expect her to play.