Novak Djokovic at the US Open

While Novak Djokovic being defaulted out of the US Open may look harsh, it was the right call in my opinion. Hitting any ball without a clear idea of where you're sending it can result in disaster. The line judge was hit in the neck, an area of the body that is potentially fatal with a knock like that. Think of all the cricketer batsmen who have died from fast balls to the neck region. Add to that the line judge was not expecting the hit.