ATP World Tour Finals: Jamie Murray & Bruno Soares win doubles opener

Murray (right) reached number one in the world rankings earlier in the year but has slipped to fourth

Jamie Murray and Bruno Soares won their opening doubles match at the ATP World Tour Finals in London.

The Briton and his Brazilian partner, who are seeded second, beat Treat Huey and Max Mirnyi 6-4 7-5 at the O2 Arena.

The match ended on a disputed line call with Scotland's Murray challenging after a Mirnyi mis-hit was called in - replays showed the ball was out.

"I wasn't going to go to bed having lost that match because we didn't challenge that call," said Murray.

Earlier on Sunday, the Bryan brothers Bob and Mike defeated Marcelo Melo and Ivan Dodig 7-6 (7-3) 6-0.

The Americans will play Murray and Soares on Tuesday in their second matches in the Edberg/Jarryd group.

Murray and Soares are in contention to end 2016 as the number one doubles team in the world, but must overhaul French duo Nicolas Mahut and Pierre-Hugues Herbert.

"Our goal is just to try to win when we step on the court this week," said Murray.

"If it ends up that we're the number one team, that will be a huge achievement for us.

"If it doesn't work out that way, we'll still have had a great year, lots to be proud of, lots to look forward to going into 2017."