SAN JOSE, Calif. (AP) -- On one of the most important points of the match, John Isner walked up to the baseline, bounced the ball between his legs and wasted no time smacking an adrenaline-fueled 138 mph ace.
2013 Australian Open
Sloane Stephens upsets Serena Williams
Best sports photos of 2012
Serena Williams wins fourth U.S. Open
Roger Federer of Switzerland attends a news conference after he was defeated in his men's singles semi-final match by Andy Murray of Britain at the Australian Open tennis tournament in Melbourne
Juan Martin del Potro of Argentina hits a return to Jeremy Chardy of France during their men's singles match at the Australian Open tennis tournament in Melbourne
Maria Sharapova of Russia reacts after defeating Samantha Stosur of Australia during their women's quarter-final match at the Qatar Open tennis tournament in Doha
