Reigning two-time champion Kim Clijsters
announced on Friday that she will not be able to defend her titles at the
upcoming U.S. Open.

Wimbledon champion Petra Kvitova was a
first-round upset victim Monday, as the 2011 U.S. Open got underway in New
York.

Five-time champion Roger Federer
was a routine second-round winner Thursday at the U.S. Open.

World No. 1 star Novak
Djokovic, second seed Andy Murray and eight-time reigning champion Rafael
Nadal were a trio of second-round winners Wednesday at the $3.465 Monte Carlo
Masters, the third ATP Masters 1000 event of the year.

World No. 1 star Novak
Djokovic and eight-time reigning champion Rafael Nadal reached the
quarterfinals, while second seed Andy Murray was a third-round upset victim
Thursday at the $3.465 Monte Carlo Masters, the third ATP Masters...

Former world No. 1 Victoria Azarenka was an
easy second-round winner, while American Bethanie Mattek-Sands stunned former
champion Li Na in Thursday's action at a rain-plagued French Open.

Sara Errani enjoyed the best season of her
career in 2012, to the point where she was named the WTA's Most Improved
Player.

Two-time champion Novak Djokovic and
reigning titlist Rafael Nadal were among Thursday's third-round winners at the
$3.475 million Italian Masters tennis event.

Former champion Venus Williams was an
opening-round winner Tuesday at the $740,000 Family Circle Cup tennis event.

Top-seeded Italian Roberta Vinci and
former top-10 player Nadia Petrova highlighted Monday's first-round winners
at the $220,000 Estoril Open tennis event.

Andy Roddick announced last week
he would end his tennis career at the 2012 U.S. Open, and Juan Martin del
Potro sent the American packing in a fourth-round affair Wednesday at the USTA
Billie Jean King National Tennis Center.

French Open singles runner-up Sara
Errani and her fellow Italian Roberta Vinci reached the women's doubles final
at the 2012 U.S. Open.

Olympic gold medalists Bob Bryan
and Mike Bryan will play for a fourth U.S. Open title on Friday.

Top seed Roger Federer started his
quest for a sixth U.S. Open championship with a three-set victory over
American Donald Young Monday night.

Former Wimbledon champion Petra
Kvitova and reigning U.S. Open titlist Samantha Stosur moved into the fourth
round, while former French Open winner Li Na suffered a third-round upset at
the final Grand Slam event of the year -- the U.S. Open.