"I managed to get through in straight sets so I'm pleased, but it was a lot tougher than the score suggests," said Murray.

"Everyone in my box always tells me it's a lot tougher watching in the heat than playing but I'm not so sure. They were brutal conditions."

Murray broke Lacko in the fourth game of the first set and held through to claim the set in 38 minutes, although he dropped three set points, netting a drop shot, sending a forehand smash well long and watching a Lacko forehand volley winner before Lacko sent a forehand wide to finally give Murray the set.

Murray and Lacko exchanged breaks to begin the second set but Murray broke again in the third and seventh games to claim the set.

Lacko double-faulted away a break in the third game of the third set and Murray powered home with ease.

Lacko's best chance seemed to be at the start of the second set when he produced an outrageous shot with his back to the net to help him break back at 1-1.

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