MELBOURNE, Australia -- Rafael Nadal took another step in his campaign to lift the Australian Open trophy on Wednesday with the top seed reaching the third round over Argentine Leo Mayer 6-3, 6-4, 7-6 (7-4).
Mayer took a set off Nadal at the U.S. Open last autumn but was powerless on this occasion.
Nadal said that with temperatures in Melbourne set to hit 104 degrees on Thursday, he would make sure he trained indoors.
"I hope the organization (closes) the roof, it's a health issue," the 16-time Grand Slam winner said. "Even if I sometimes like to play in heat, when it's too much it becomes dangerous for the health.
"I don't want to (see) retirements, that creates a bad show for the crowd. Why not put the roof when the conditions are so extreme?"
Wimbledon finalist and sixth seed Marin Cilic defeated Joao Sousa 6-1, 7-5, 6-2 while Spanish 10th seed Pablo Carreno Busta advanced when Frenchman Gilles Simon, who quit trailing 6-2, 3-0.
French 15th seed Jo-Wilfried Tsonga needed five sets to edge Canadian teenager Denis Shapovalov with a 3-6, 6-3, 1-6, 7-6 (7-4), 7-5 win.
"The most important for me was to fight and give my best on court until the last point," Tsonga said. "That's what I did today. I think he deserved to win also today.
"I was courageous and I did my job at the end. I played well. It was surprising to win, but I believed in it, that's why I won."
Italy's Andreas Seppi defeated Yoshita Nishioka of Japan 6-1, 6-3, 6-4, Brit Kyle Edmund advanced past Denis Istomin 6-2, 6-2, 6-4 and Luxembourg veteran Gilles Mueller defeated Tunisian Malek Jaziri 7-5, 6-4, 6-7 (5-7), 3-6, 6-2.