Andy Murray wasn't maybe totally satisfied by his haircut or more probably some of his front hairs were disturbing him. He made a little on-court adjustment to it during his match against Rafael Nadal in London (ATP Finals 2015, Masters).
Breaking one racquet might be called careless, but to break four... Marcos Baghdatis destroys four racquets en route to a four-set loss to Stanislas Wawrinka.