In US Open; Monica Puig,who is the Rio Olympic Gold medalist made an exit in the first round while 32 ranked Puerto Rican Puig was throw out by 60th ranked Chinese Zheng Saisai in staright sets 4-6, 2-6.

Meanwhile, Puig had astonished the sports world with wins over Petra Kvitova and Angelique Kerber in the semifinals and finals of the Olympics to take home Puerto Rico's only Gold medal in Rio.

Second seed German Angelique Kerber and third seed Spaniard Garbine Muguruza have advanced to 2nd round.

Serena Williams, the world number one will play her first round match later tonight.