In their fourth-round match, Andy Murray caught Denis Istomin on the run and forced him to hit a weak "tweener." But when Murray tried to put away the volley, he... well... couldn't. That's a bit too casual, Andy.
But later in the match, Murray lucked out on another mishit: a horrible forehand shank actually floated in and allowed him to break. That shank worked out for him, and he went on to serve out the match.