Washington Open: China’s Wu collapses while leading against Japan’s Yosuke Watanuki

China’s Wu Yibing collapsed and was helped off the court on Monday after retiring from his opening match against Japan’s Yosuke Watanuki at the Washington Open. On the Washington hardcourts, Wu was leading 4-1 in the first set when he made a wobbly step, went to take a seat and collapsed forward over the back of a folding chair. The 23-year-old from Hangzhou also played last week in Atlanta, beating France’s Corentin Moutet in his first match before losing to eventual champion Taylor Fritz, the world number nine from the United States, in the second round. World number 90 Wu won his first ATP title in February at Dallas, becoming the first Chinese player to capture an ATP crown and China’s highest-ranked player ever, reaching 54th in the world in May.