Aug 10 : The Professional Tennis Players Association said on Monday that a string of withdrawals from the Canadian Open underscored concerns that professional tennis's lengthy calendar and expanded top-level events are increasing injury risks.The players' advocacy group said it was saddened but not surprised

TENNIS-MONTREAL/ (PIX, TV):Tennis-PTPA cites player workload concerns after Canadian Open withdrawals | Tennis News

Aug 10 : The Professional Tennis Players Association said on Monday that a string of withdrawals from the Canadian Open underscored concerns that professional tennis's lengthy…