Djokovic and Murray just walked down a bunch of hallways all the way out to the court together. They got there and posed for pictures together, smiling. Now, of course, they are warming up with each other.
I want to see this in football! I want to see the guys all walk out of the same locker room, pose for pictures, and then toss the ball to each other to warm up.
Also, every sport needs a chair umpire.