Roger Federer and Rafael Nadal among others to pay tribute to Brad Drewett . ATP 's former champion passes away on Friday after suffering with illness . Federer will be defending his title at the Madrid Masters this week . The stars of tennis took time out from their French Open preparations Sunday to honor the man who helped them become some of the highest-paid athletes in the world . Serena Williams makes defense of her title in women 's singles with win on Sunday .
Roger Federer and Rafael Nadal among others to pay tribute to Brad Drewett . ATP 's former champion passes away on Friday after suffering with illness . Federer will be defending his title at the Madrid Masters this week . Serena Williams makes defense of her title in women 's singles with win on Sunday .