By Janina Nuno Rios NEW YORK (Reuters) -World number one Aryna Sabalenka began her U.S. Open title defence in style with a 7-5 6-1 win over Switzerland's Rebeka Masarova in the first round on Sunday.

Aryna Sabalenka began her US Open title defence in convincing fashion, needing just 81 minutes to overcome Rebeka Masarova on Arthur Ashe Stadium. The world number one, who has fallen in two Grand Slam finals this season,

Defending champion Aryna Sabalenka moved into the second round of the U.S. Open after weathering a challenging first set in her first match.