Jamie Murray moved closer to a number one double with brother Andy as he and Bruno Soares defeated Bob and Mike Bryan for their second win at the ATP World Tour Finals.
Murray and Soares still have work to do if they are to overhaul Nicolas Mahut and Pierre-Hugues Herbert to finish the year as the top doubles pair, but defeat for the French duo on Monday opened the door.
With Andy Murray also in prime position to top the singles standings, it would cap a remarkable year for the family.
Read more: On Her Majesty's service as Jamie Murray gets No.1 bid up and running
The Bryan twins are no longer the force they were but nevertheless it was a very impressive performance from Murray and Brazilian Soares, who only dropped seven points on serve in a 6-3 6-4 win.
They will now be guaranteed a place in the semi-finals at the O2 Arena unless Marcelo Melo and Ivan Dodig beat Treat Huey and Max Mirnyi in straight sets on Tuesday evening.
Should that happen, Murray and Soares can make absolutely sure by beating Melo and Dodig in their final group match on Thursday.
Murray said: "We certainly played a great match from start to finish. Probably one of our best matches of the year. We served really well throughout. I think we had a good game plan to play against them.
"I think we're both super pumped about the win. (We) Should have a good chance to progress further in the tournament now."
Last year, Murray made his debut at the tournament with Australian John Peers and the pair were denied a place in the last four when they missed five match points before losing a dramatic match to the Bryans.
"I thought about it in the changeover in the last game," said Murray. "A lot of people come up and ask me about that still."
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