Andy Murray of Britain returns to Mikhail Kukushkin of Kazakhstan during the singles first round match at the All England Lawn Tennis Championships in Wimbledon, London, Tuesday June 30, 2015. (AP Photo/Tim Ireland)
Tim Ireland
June 30, 2015

LONDON (AP) It's not necessarily the heat, and it's not necessarily the humidity.

When it comes to playing through high temperatures at Wimbledon, a tournament known more for its rain delays than its sunny disposition, it's about keeping the points short.

''Because the points are much quicker, you don't feel it as much,'' said Andy Murray, the 2013 Wimbledon champion. ''But you play three or four long rallies in a row and you feel it more.''

Murray played through it Tuesday during his 6-4, 7-6 (3), 6-4 opening round victory over Mikhail Kukushkin of Kazakhstan on Centre Court. He said he was told the on-court temperature reached 41 degrees C (106 degrees F).

That's a rare number for London, even in summer.

''It was definitely hot today,'' said Murray, the first British man to win the Wimbledon title since Fred Perry in 1936. ''I mean, I haven't played loads of matches on that court when it has been as warm as that.''

Murray was one of three former men's champions to advance to the second round on Day 2 at the All England Club. Roger Federer, who is looking for a record eighth title, beat Damir Dzumhur of Bosnia 6-1, 6-3, 6-3. Two-time champion Rafael Nadal defeated Thomaz Bellucci of Brazil 6-4, 6-2, 6-4.

All three played under sunny skies, with more hot weather expected Wednesday. Novak Djokovic, the defending champion who lost to Murray in the 2013 final, will have to adapt to those conditions when he faces Jarkko Nieminen of Finland on Centre Court early on Day 3.

Because of the high temperatures, Wimbledon organizers have outlined how their ''Heat Rule'' works. The rule, which applies only to women's singles matches, allows players to take a 10-minute break between the second and third sets if the heat stress index reaches 30.1 degrees C (86 degrees F). The heat stress index factors in temperature along with humidity and surface temperature.

It certainly seems to have been that hot on Centre Court on Tuesday afternoon, but the rule doesn't apply to men's matches.

And while Murray managed to advance in straight sets despite the hot conditions, he did have a little blip midway through the match.

''I lost my serve a bit in the end of that second set. There was a period where I missed like 10 or 12 first serves in a row and let him back into it there,'' Murray said. ''Then he played some really good stuff at times and was going for his shots.

''I found it difficult to play aggressive tennis out there. I was glad to get through in straight sets.''

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