Australian tennis player Nick Kyrgios said he's devastated after losing to Karen Khachanov in their US Open quarter-final. "I'm just devastated. Just feel like it was either winning it all or nothing at all...I feel like I've just failed at this event right now," he stated. Khachanov won with a scoreline of 7-5, 4-6, 7-5, 6-7 (3-7), 6-4.