The top seed and world number one looked in fine form on Rod Laver Arena, comfortably progressing 6-3 6-0 6-2 against his teenage opponent.

But there was a moment of concern at 1-1 in the final set when Murray went down clutching his ankle after chasing down a ball.

He recovered to break in that game but was still moving somewhat gingerly for a time before securing his place in the next round and a meeting with Sam Querrey.

"I don't know how bad it is. Just normally if it's something severe, a serious ankle injury, you can't put weight on your foot," Murray said. "Ankles, you normally feel a bit worse 20 or 30 minutes after you stop moving around on them.

"It's just a little bit stiff just now. It's okay. I don't think I've done too much damage.

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

"It's not too bad. It's all right. Just a bit sore. It can sometimes swell overnight. I'll just have to wait and see in the morning.

"I heard a few sort of little crackles, and it was sore. It was throbbing kind of for the rest of the match. I was moving fine on it, though. It was just sore. So you're thinking about it because you have a little bit of pain when you're moving around.

"Also when you're moving into certain positions again on the court, you don't want to do the same movement again. But, yeah, I was moving fine towards the end of the match."