Sergiy Stakhovsky does some vigilante iPhone line judging at the French Open

Ukrainian tennis player Sergiy Stakhovsky fell to Richard Gasquet in three sets in the first round of the French Open Monday. He may find work even after elimination, though, as he demonstrated excellent line judging skills while disputing a call in the first set. Stakhovsky stopped play, dropped his racquet, grabbed his iPhone, and snapped a photo of the mark left by the ball. The photo, later posted to Stakhovsky’s Twitter, is above, and...uh...I guess one of those smudges means something?