On Wednesday in Shanghai, Roger Federer was leading by a set and a break over Diego Schwartzmann. The Argentine missed a first serve, and tried some sort of trick move to stop the ball. It failed. And the two shared a laugh.

It was a light moment on a grand stage, as a spot in the third round of the ATP Masters 1000 was at stake.

Don't feel to bad for Schwartzmann, as he had some flawless moments to go with the flub: 

Federer would advance, 7-6 (4), 6-4. Though the winner of Shanghai will earn 1,000 ranking points, Federer is 2,370 points behind world No. 1 Rafael Nadal. Finishing the year at No. 1 is officially not a priority for the Swiss: 

He'll play Alexandr Dolgopolov next.