It is, I think one of the best things from a volatility perspective is that the game can last forever. So a large swing is quite likely. But that's also it's fault, one trading session can last forever too!
Great final set and tiebreaker but far too many errors from Murray, first serve was very poor. Maybe he was trying to get too much on it. Ended up only £1 on Federer not much reward for the effort!