JAMIE MURRAY insists brother Andy would be welcome at any of his Wimbledon matches after powering through with John Peers to the men's doubles semi-finals.

While Andy targets the singles title, his older brother has made impressive progress through the doubles draw alongside Australian Peers, with a 6-4, 7-6 (7/3), 6-3 victory over Austrian Alexander Peya and Brazilian Bruno Soares sealing a last-four place.

The siblings rarely watch each other's match in person, and Andy suggested he was a jinx to Jamie.

"One person I rarely watch on TV is my brother Jamie," Andy said. "I don't really like it. It's probably not the case, but it feels as though when I watch him, he loses."

But Jamie laughed off the suggestion, saying: "I've lost a lot of matches where he hasn't been there so I'm not quite sure that's true. He can watch if he wants to."

Doubles specialist Jamie, now 29, was a mixed champion with Jelena Jankovic at Wimbledon eight years ago, his career highlight to date.

He and Peers paired up in early 2013 and have made steady but significant progress since, with this their best grand slam performance.

Peers served them over the winning line, the pair embracing as the Court Two crowd roared approval, Murray's mother Judy leaping to her feet in the stands to punch the air in delight.

"This is a good breakthrough for us in terms of stepping up at the biggest tournament there is, and we'll keep trying to work hard and get better," said Jamie.

He added: "We've been going in the right direction over the last 18 months and I think we deserve to be where we are. We'll be giving it our all on Thursday to try to get to the final."

Murray and Peers will tackle Israel's Jonathan Erlich and German Philipp Petzschner for a place in the final, after their Court 18 victory over the No.2 seeds, Ivan Dodig and Marcelo Melo.

And Jamie reckons Andy will also clinch a last-four place when he faces Vasek Pospisil on Centre Court at lunchtime on Thursday.

He said: "I won't go and sit in the stadium and watch, but I'll probably watch on TV.

"I think Andy's obviously a big favourite. For Vasek, it's his first grand slam quarter-final, that's a big achievement for him and a big step forward in his career.

"He's got a lot of game he can hurt Andy with, but over five sets it's going to be difficult for him, especially with the amount of tennis he's played over the last few days."