MELBOURNE, Jan. 18 (Xinhua) -- The Australian Open top seeds have survived another day as the hot conditions turned cold, though Aussie firebrand Nick Kyrgios has gone home.

Andy Murray's quest for a maiden Australian Open title remains on track after a straight sets victory over Russian qualifier Andrey Rublev, though questions over the second week remain.

Reigning champion Novak Djokovic on Tuesday said his tough opening bout against Fernando Verdasco was the best preparation for his title defence, having to approach the opening round and the tournament "with the right intensity right from the blocks."

Rublev however proved a sedate opponent, falling in straight sets: 6-3, 6-0, 6-2, barely challenging the reigning world champion on serve. A twisted ankle in the third set is also adding concerns to the world no. one's third round match against Sam Querrey.

"I don't know how bad it is, just normally if it's something like severe, a serious ankle injury, you can't put weight on your foot," Murray told reporters. The Brit "heard a few sort of little crackles, and it was sore" during the match, but "I was moving fine on it."

"There's not a whole lot you can do apart from (icing) just now. (I'll) see in the morning how it feels when I wake up. But hopefully it will be all right."

Querrey will be a true test in the lead up to the finals, but Murray insisted he' ll be ready after some tough matches in the Doha warm up tournament and his challenging first round.

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