| Nadal, Spain's 20-time Grand Slam champion, is the first of the sport's Big Three to enter Washington's summer classic. For Nadal, 35, the August event will mark his return to competition after taking time off following a grueling French Open semifinal in June. He opted to forgo both Wimbledon and the Tokyo Olympics, so the Citi Open will mark the start of his preparation for the U.S. Open. | 
