I know!! He actually usually used the F-bomb. Wow- one doesn't hear that kinda stuff from him usually. The last couple of years he's really tamed down his anger on court. Hope he completly chills out the next couple of days an then gets ready for Miami.
He can be pretty angry at times, but indeed, it's never this extreme and pretty much always directed towards himself instead of another person. Don't know what to think about it, but I don't want to take anything concrete from it considering he's always been bad at Indian Wells and might be frustrated about that. Although here he was still in firm control of the match, so I don't know