Intentional or not, Djokovic is at fault

Novak Djokovic erred and has aptly paid the price for it. It's a bit harsh, some might feel, to be defaulted from a Grand Slam for unintentionally hitting the ball at a line judge. But the fact remains that Djokovic had no business swatting the ball away like that in the first place.

And it's not the first time in that US Open...