Defending champions Sabalenka, Alcaraz face hometown heroes in US Open

Sept 5 : The U.S. Open enters its round of 16 on Sunday, with defending champions Aryna Sabalenka and Carlos Alcaraz taking on American hopes Taylor Townsend and Tommy Paul respectively while Ben Shelton, the highest-ranked American in the men's draw, faces a difficult test against Stefanos Tsitsipas.TOP WOMEN'S MATCH: ARYNA SABALENKA V TAYLOR TOWNSENDSabalenka's improved serve helped her to secure a comfortable third-round victory, as she landed 10 aces in a straight-sets win over Kamilla Rakhimova.The four-time Grand Slam winner, who is aiming for a hat-trick of U.S. Open titles, has yet to drop a set in the tournament, and was more affected by the smell of cannabis in the Louis Armstrong Stadium than her opponents. "If they're going to keep smoking, I might get high," Sabalenka joked af