In a Grand Slam like the US Open, top tennis players have to be able to block out unwanted distractions. A crowd that's starting to side with your opponent is one problem, but a drone? That's something most competitors aren't prepared for. As the Guardian reports, a 26-year-old teacher has now been arrested after a quadcopter crash-landed into an empty section of the stands. Flavia Pennetta and Monica Niculesu were facing off on Thursday night when the 3DR Solo swooped in unannounced. Videos have emerged documenting the crash -- although no-one was hurt, it clearly broke the flow of the match and worried the players, their families and fans. Curiously, the intruding drone didn't appear to have a camera on board -- it's possible that it snapped off during the landing, but otherwise it's unclear exactly why the pilot was flying there in the first place. As we've seen in the past, usually drones sneak into sporting events to capture all of the action.