Roger Federer and Roger Federer among stars to pay tribute to Rafael Nadal . the Madrid Masters 's former president passed away on Friday after battle with illness . Federer will be defending his title at ATP Sunday . Serena Williams begins defense of her title in women 's event with win on Sunday .
Roger Federer and Rafael Nadal among stars to pay tribute to Brad Drewett . ATP 's former president passed away on Friday after battle with illness . Federer will be defending his title at the Madrid Masters this week . Serena Williams begins defense of her title in women 's event with win on Sunday .