The Australian Open

9f0d1dcffb2ce301480f6a7067005f96.jpg

Bethanie Mattek-Sands of the U.S. makes a forehand return to Maria Sharapova of Russia during their first round match at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 14, 2014.(AP Photo/Eugene Hoshiko)

f801322afb19e301480f6a7067007fe5.jpg

Maria Sharapova of Russia plays a backhand return to Bethanie Mattek-Sands of the U.S. during their first round match at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 14, 2014.(AP Photo/Rick Rycroft)

8ebad170fb02e201480f6a70670045e8.jpg

Bernard Tomic of Australia talks to medical staff during his first round match against Rafael Nadal of Spain at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 14, 2014.(AP Photo/Eugene Hoshiko)

c7fd99c0fa91e001480f6a706700e169.jpg

Juan Martin del Potro of Argentina waves after winning over Rhyne Williams of the U.S. in their first round match at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 14, 2014. (AP Photo/Andrew Brownbill)

a90bf227facee101480f6a706700aa99.jpg

Sloane Stephens of the U.S. looks to make a backhand return to Yaroslava Shvedova of Kazakhstan during their first round match at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 14, 2014.(AP Photo/Aaron Favila)

65571dd3fa9ee101480f6a7067003058.jpg

Andreas Seppi of Italy celebrates after defeating Lleyton Hewitt of Australia in their first round match at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 14, 2014. (AP Photo/Eugene Hoshiko)