Melbourne, Australia: After a day of searingly-hot temperatures which raised complaints from players, top-seeded Rafael Nadal advanced to the second round of the Australian Open in relatively mild conditions.
Nadal's Australian opponent Bernard Tomic, bothered from the start by a left leg injury, retired from the match after losing the first set 6-4. Some in the capacity crowd of 15,000 at Rod Laver Arena booed lustily when Tomic indicated he could not continue.
Roger Federer, Andy Murray and defending champion Victoria Azarenka advanced earlier Tuesday amid temperatures that topped 42 Celsius (108 Fahrenheit).
Third-seeded Maria Sharapova joined them when she beat American Bethanie Mattek-Sands 6-3, 6-4 in the last match of the night. Mattek-Sands double-faulted on break point in the ninth game of the second set, and Sharapova served out.
Tomic called a medical timeout after three games, and twice more before he quit.
"Unfortunately, it's unlucky how it happened. I went for one ball and felt pain in my left leg," Tomic said of the training injury.
Nadal said he felt for his opponent.
