Australian Sam Groth plans to take the fight to Andy Murray when they meet in the second round of the Australian Open on Thursday.
But he joked that he hoped Murray's wife Kim Sears would go into labour so the British great would withdraw from the match. 
Groth, 28, hit 27 aces to beat Frenchman Adrian Mannarino in four sets on Tuesday, in his first win since the US Open in   June.
With a world ranking of 67, he will be the clear underdog when he plays Murray, but Groth said he would approach the contest with the attitude that he had nothing to lose. He planned to serve hard and play aggressively, with the backing of a home crowd.
Sears is due to give birth to the couple's first child in   February, and Murray has said if she were to go into labour he would leave the tournament immediately. "I might just be cheering for that one," Groth said.
It was a drought-breaking victory for Groth, who had lost in the first round of his past four tournaments, including the Brisbane and Sydney Internationals.
Murray enjoyed an easy first-round win against German Alexander Zverev, scoring 6-1, 6-2, 6-3 in just more than two hours.
He said he would have liked to finish the match more quickly, but that Zverev, 18, was a good young player who was taller than most.
"It might take him a little bit longer to sort of develop into his body," he said. "He's got a lot of potential, for sure."
The world No.2 has four times reached the Australian Open final, but never won.
Murray said Groth was a competitive player who fought hard and had a good attitude. "He will make it tough for me because he has a different game style to a lot of the players now," he said.
Towards the end of last year the Australian had surgery on his right foot to treat an ongoing nerve problem and he said it felt good.
"Everyone keeps asking me about how's my foot and how I'm handling the pressure of everyone watching me ... I think today I handled both of those great.
"I'm pretty happy to get my first win of the year."