Kei Nishikori was having a rough go of things in the first set of his quarterfinal match against Stan Wawrinka, but he has since regrouped to make this a compelling finish. He dropped the first set 6-3 and then won the next two grueling sets 7-5 and 7-6, pushing the third-seeded Wawrinka to a fourth and, the way this is going, likely fifth set. Serving from deuce at 5-5 in the third set, Nishikori had Wawrinka scrambling and pulled a winner out of thin air.
Here's another angle:
Then he mean mugged right into the camera. All Stan could do was clap. Let's check out that mean mug, shall we?