The Murray brothers are trying to make being No.1 a family business, with older brother Jamie securing the top spot in the doubles team ranking while Andy leads the competition for the No. 1 singles ranking.

On Saturday, Andy Murray beat Milos Raonic in an epic three-setter, 5-7, 7-6 (5), 7-6 (11) to advance to the final.

Jamie and his doubles partner Bruno Soares will finish the season as the top doubles team, clinching their position when Nicholas Mahut and Pierre-Hugues Herbert dropped all three of their round robin matches in the ATP Tour Finals. In the individual doubles rankings, Mahut is No. 1, but Soares could move in front by winning the tournament. Jamie reached the individual doubles No. 1 ranking during the season.

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In singles, Murray—who is playing his first event as No. 1—qualified for the ATP Tour Finals semifinals with three round robin victories, as did Novak Djokovic. Murray will stay No. 1 unless Djokovic wins the tournament, but Murray would have to equal Djokovic's performance to stay in front once his Davis Cup victory points come off in a week.

The brothers have enjoyed cheering each other on, with Jamie winning his first two Grand Slam titles and Andy his third.

"The whole year has been fantastic for both of us. We’re probably each other’s biggest fans," said Andy, speaking to press at the ATP Tour Finals. "It’s really special to get to watch what he’s achieved in the biggest competitions in the sport."

As kids, according to Murray, they had not anticipated competing side by side for the top spots. "We used to play against each other all of the time pretty much until we were like 12 to 14," Andy said, though that was before each moved to pursue their professional careers. "But we did play golf together. We played squash together, table tennis. We were always competing against each other from a young age. Now we obviously don’t."

Since ATP rankings began, no brothers have been singles and doubles No. 1 players.