John McEnroe on Andy Murray

By John McEnroe Three-time Wimbledon champion and BBC Sport pundit

Lleyton Hewitt's surprise win over Juan Martin del Potro would not be a bad match-up for Murray

I don't know if we learned a whole lot, but I can't ever recall Andy serving bigger or better than he did against Ernests Gulbis.

He definitely took it up a notch on Centre Court, which is what you want to see after his struggle in the first-round match against Robby Kendrick.

Andy showed exactly why he is number three in the world and one of the favourites for the final.

He took that match to Gulbis, imposing his all-round game and athleticism.

After that early opportunity for Gulbis to break Murray's serve in the second game of the first set, Andy hit four big serves to seal the game.

I don't know if Gulbis ever felt he had a chance. He really had little idea about court position, hopefully he will take a look at this videotape and learn from that.

As for Andy's third-round opponent, Viktor Troicki, the 30th seed, he is very athletic, big hitter. I like the way he plays, he's dangerous.

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Lleyton Hewitt's surprise win over Juan Martin del Potro would not be a bad match-up for Murray were he to play Hewitt in the top half of the draw.

I don't think Del Potro ever believed in himself on this surface. However, it was an unbelievable game plan by Hewitt that was well executed.

But as well as Lleyton played, it will be difficult for him to bounce back match after match after having been around for so long should he find himself up against Murray.

John McEnroe was talking on BBC Two's live Wimbledon coverage