Rafael Nadal's French Open preparations are being guided by his delicate knees. Nadal is skipping this week's Barcelona Open, where he is a five-time champion, after injuries to both knees last year hampered his goal of a fifth straight title at Roland Garros and forced him out of Wimbledon. The Spaniard was sidelined for two months in 2009 after an early French Open exit to Robin... More...