Serena Williams of the United States celebrates during the second round of ladies' singles against Caroline Garcia of France on day 4 of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club in London, Britain on June 27, 2013. Serena Williams won 2-0. (Xinhua/Wang Lili)

Serena Williams of the United States gestures during the second round of ladies' singles against Caroline Garcia of France on day 4 of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club in London, Britain on June 27, 2013. Serena Williams won 2-0. (Xinhua/Wang Lili)

Serena Williams of the United States gestures during the second round of ladies' singles against Caroline Garcia of France on day 4 of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club in London, Britain on June 27, 2013. Serena Williams won 2-0. (Xinhua/Wang Lili)

Serena Williams of the United States celebrates during the second round of ladies' singles against Caroline Garcia of France on day 4 of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club in London, Britain on June 27, 2013. Serena Williams won 2-0. (Xinhua/Wang Lili)

Serena Williams of the United States reacts during the second round of ladies' singles against Caroline Garcia of France on day 4 of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club in London, Britain on June 27, 2013. Serena Williams won 2-0. (Xinhua/Wang Lili)

Serena Williams of the United States greets the spectators after the second round of ladies' singles against Caroline Garcia of France on day 4 of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club in London, Britain on June 27, 2013. Serena Williams won 2-0. (Xinhua/Wang Lili)

Serena Williams of the United States reacts during the second round of ladies' singles against Caroline Garcia of France on day 4 of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club in London, Britain on June 27, 2013. Serena Williams won 2-0. (Xinhua/Wang Lili)