Serena Williams got on and off court as quickly as she could in the scorching heat Friday, registering yet another record with match win No. 61 at the Australian Open as she advanced to the fourth round with a 6-3, 6-3 victory over Daniela Hantuchova. The five-time Australian Open champion later withdrew from the doubles, avoiding any extra exposure to the blazing sun during the once-in-a-century heat wave that was gripping Melbourne for a fourth straight day. Two-time finalist Li Na, the major threat to top-ranked Williams in the top half of the women's draw, had to save a match point before coming back to beat No. 26-seeded Lucie Safarova 1-6, 7-6 (2), 6-3 in 2 hours, 37 minutes. Li, the 2011 French Open champion, later joked that she needed the match practice ''because I think the weather is not warm enough.'' Williams didn't face any serious danger in her win over No. 31-seeded Hantuchova, whose only win in 10 head-to-head matches came in the corresponding round at the 2006 Australian Open. More...