Nadal would train for 2.5 hrs, Federer did for 20 mins: Gilbert

Former US tennis player Brad Gilbert said Rafael Nadal is fuelled by doubts. "He would have two and a half hour [practice] sessions...Roger Federer used to...practise for 20 minutes," he added. Talking about Federer, former world number one Andy Roddick stated, "There's nothing more frustrating than consistently losing to someone and then watching them...not be concerned with form in practice."