JAMIE Murray has backed brother Andy to bounce back from US Open heartache in time for next week's crunch Davis Cup semi-final against Australia.

Murray Jnr made his earliest exit from a grand slam in five years on Monday after losing in four sets to the South African Kevin Anderson.

The world No.3 flew home from New York on Tuesday and will now set about refreshing mind and body ahead of Britain's crucial match with Australia in eight days' time.

The Scot endured a similarly swift rehabilitation in July when he lost to Roger Federer in the semi-finals at Wimbledon but jumped off the canvass a week later to win three Davis Cup rubbers and lead Britain to victory over France.

GB's team spirit has given Murray great satisfaction this year and there is consolation in avoiding the rush back to Glasgow that would have come with reaching the final at Flushing Meadows.

"I guess the positive of losing, if you like, is that he gets more time to rest and recover and get ready for Davis Cup," Murray's brother Jamie said. "I'm sure he's pretty excited to go back and join up with the team and play for the country again. He's always seemed to love it. It's a huge tie for us coming up. I'm sure all his focus will turn to that pretty soon."

Jamie Murray's New York adventure is still very much alive after he and his Australian partner John Peers beat fourth seeds Marcin Matkowski and Nenad Zimonjic in the last eight of the doubles on Tuesday.

It is Jamie Murray and Peers' second consecutive major semi-final after they made the final at Wimbledon two months ago before losing to Jean-Julien Rojer and Horia Tecau.

Andy Murray was not at the pair's latest win but expressed his delight, tweeting: "That made me feel much better #bigbro".

"He just texted me to say well done," Jamie said.

"For us we just want to keep trying to win. We're in the semi-finals now. Why not get to the final?

"We'll have a tough match in the semis, but it will also be a tough match for them.

"We got to the final of Wimbledon and it was a great run for us - I guess you kind of get that hunger to do it again and a couple of months later we have that chance to try to get back to the final again. So we're pretty fired up about it."

Jamie Murray and Peers will now face either the American pair of Steve Johnson and Sam Querrey or Leonardo Mayer and Joao Sousa in the last four.

The successful partners could have been on opposite sides of the net in the Davis Cup doubles rubber next week but, despite holding Australia's highest doubles ranking of 14th in the world, Peers was not selected.

"I would have hoped to have been picked, but unfortunately it didn't go that way," Peers said.

Jamie Murray added: "I don't think they've selected their strongest team so for us that is obviously a positive.

"I feel bad for John because I know he is by far their best doubles player and he deserves to be in that team but for whatever reason he's not getting picked.

"But that's to our advantage and we will, hopefully, try and use that."