Chasing a drop shot in the second set, Rafael Nadal stumbled and tumbled into the net as his racket went flying to the sideline. It just wasn't his day. Nadal rose slowly to cheers from the crowd but found himself off balance the rest of the way and made his earliest Grand Slam exit since 2005. Nadal was overpowered in the second round by Lukas Rosol, a Czech ranked No. 100 in the world, 6-7 (9), 6-4, 6-4, 2-6, 6-4.