Samantha Stosur, from Australia, reacts in her first match against Anabel Medina Garrigues at the Western & Southern Open tennis tournament, Tuesday, Aug. 14, 2012, in Mason, Ohio. (AP Photo/David Kohl)

Samantha Stosur, from Australia, returns to Anabel Medina Garrigues, from Spain, in their first match at the Western & Southern Open tennis tournament, Tuesday, Aug. 14, 2012, in Mason, Ohio. (AP Photo/David Kohl)

Anabel Medina Garrigues, from Spain, returns a shot to Samantha Stosur, from Australia, in their first match at the Western & Southern Open tennis tournament, Tuesday, Aug. 14, 2012, in Mason, Ohio. (AP Photo/David Kohl)

Johanna Larsson, of Sweden, returns a shot to Marion Bartoli, of France, in their first match at the Western & Southern Open tennis tournament, Tuesday, Aug. 14, 2012, in Mason, Ohio. Larsson won 6-4, 6-2. (AP Photo/David Kohl)

Serena Williams returns a shot to Eleni Daniilidou, from Greece, in their first round match at the Western & Southern Open tennis tournament, Tuesday, Aug. 14, 2012, in Mason, Ohio. Williams won 6-3, 6-4. (AP Photo/David Kohl)

Marion Bartoli, of France, returns a shot to Johanna Larsson, of Sweden, in their first match at the Western & Southern Open tennis tournament, Tuesday, Aug. 14, 2012, in Mason, Ohio. Larsson won 6-4, 6-2. (AP Photo/David Kohl)

Eleni Daniilidou, of Greece, returns a shot to Serena Williams, of the United States, in their first match at the Western & Southern Open tennis tournament, Tuesday, Aug. 14, 2012, in Mason, Ohio. Williams won 6-3, 6-4. (AP Photo/David Kohl)

Serena Williams reacts in her first match against Eleni Daniilidou, from Greece, at the Western & Southern Open tennis tournament, Tuesday, Aug. 14, 2012, in Mason, Ohio. Williams won 6-3, 6-4. (AP Photo/David Kohl)

Serena Williams reacts in a match against Eleni Daniilidou, from Greece, at the Western & Southern Open tennis tournament, Tuesday, Aug. 14, 2012, in Mason, Ohio. Williams won 6-3, 6-4. (AP Photo/David Kohl)

Serena Williams waves to the crowd after defeating Eleni Daniilidou, from Greece, at the Western & Southern Open tennis tournament, Tuesday, Aug. 14, 2012, in Mason, Ohio. Williams won 6-3, 6-4. (AP Photo/David Kohl)

Yen-Hsun Lu, from Taiwan, reaches for a shot from Tomas Berdych, from the Czech Republic, in a first match at the Western & Southern Open tennis tournament, Tuesday, Aug. 14, 2012, in Mason, Ohio. (AP Photo/David Kohl)

Tomas Berdych, from the Czech Republic, returns a shot from Yen-Hsun Lu, from Taiwan, in a match at the Western & Southern Open tennis tournament, Tuesday, Aug. 14, 2012, in Mason, Ohio. (AP Photo/David Kohl)