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“It felt pretty hot, like you’re dancing in a frying pan or something like that,” she said after advancing to the second round.

Always cool under pressure, Roger Federer avoided touching the hot ground at changeovers by sitting on his bench with his feet up on a towel. The 17-time Grand Slam winner advanced to the second round, saying for him the heat was “just a mental thing.”

No. 4 Andy Murray struck a more sober tone.

“As much as it’s easy to say the conditions are safe,” Murray said, “It only takes one bad thing to happen.”

“It looks terrible for the whole sport when people are collapsing, ball kids are collapsing, people in the stands are collapsing,” the Wimbledon champion said. “That’s obviously not great.