Andy Murray kept Britain's Davis Cup hopes alive, eventualluy overcoming Austria's Jurgen Melzer in four sets.

The British No 1 defeated Melzer 6-4, 5-7, 6-4, 6-1 in a tough and high-class rubber on Wimbledon's Court One to square the tie at 2-2.

Britain's hopes of retaining their status in the world group of 16 elite tennis nations now rest on Alex Bogdanovic beating Austrian No 2 Alexander Peya later this afternoon in the deciding rubber.

For Murray, victory against Melzer was sweet after the Austrian had upset him by questioning his ability to cope with the pressure earlier this week. Melzer, ranked 41 in the world, had gone within two points of beating Murray in the third round of the US Open.

And there were times when his all-court game looked capable of causing an upset in front of a partisan Court One crowd. For most of the first set Murray was in the grumpiest of moods, complaining to French umpire Cedric Maurier that the court in shadow behind the baseline was slippy.

"It's insane. I'm sliding more than on a clay court," Murray said.

It seemed to prey on his mind and his tennis was erratic, until he dug deep in the sixth game, coming back from 0-40 to strike a psychological blow which saw him take the early advantage. John Lloyd, the British captain, had decided to rest Murray from yesterday's doubles but the British No 1 showed few signs of his abductor strain.

He was in control of his serve, one delivery clocking in at 133mph, but an inexplicable loss of concentration saw him surrender the initiative in the second set when he gifted a break of serve to the Austrian in the eighth game. Melzer took the set and the match had turned into a dogfight, with the Austrian's drop shots and wild forehands breaking up the rhythm and tempo.

The pair swapped service breaks at the start of the third set and the Austrian was looking increasingly dangerous until the seventh game proved crucial, Murray hanging in and pressuring his opponent with stinging returns to take the vital break of serve on his fifth break point.

The initiative was Murray's and when he broke Melzer's serve in the first game of the fourth set and held on for a crucial victory.