To U-S Open, China's Zheng Saisai would open up the tournament against Olympic champ, Monica Puig. The Puerto Rican, was hoping that fine play in Rio would translate in new York, but the Chinese had other ideas.

Puig serving at 4-all in the opening set, but Zheng has a break point, the Chinese takes advantage of the opportunity after the Puerto Rican's volley is long. The Chinese can serve out the set

And anothe error from Puig hands the first frame to Zheng -- 6-4 the scoreline. The bespecled one would take control of the second set -- serving at 5-2, and in control -- and is now two points from winning the match. And she punctuates things with an ace on match point -- 6-4, 6-2 is how it ends.

U.S. Open: China's Zheng Saisai beats Monica Puig 6-4, 6-2 to advance

Victory marks first-ever win for Chinese at event

China's Wang Yafan was facing Van Uytvanck of Belguim. And the Chinese would fire this for a winner, en route to taking the first set 6-3.

The second set would be tight, and it would need a tie-break, but it goes Wang's way -- as the Belgian fires long. 6-3, 7-6 the final, as the 22-year-old grabs her first ever vicotry at the event. 

First time Chinese has made second round at Flushing Meadows

Another Chinese looking for her first victory here is Duan Yingying, who was facing Maria Sakkari of Greece. The Chinese took the opener 6-4.

the Greek would fight back and takes the second 6-4 to level things and force a decider.

But Sakkari would have no answer in the following set, as she hands the Chinese victory after finding the net on match point. 

German can become No. 1 if she betters S. Williams at event

Germany's Angelique Kerber enjoyed a stress-free passage into the second round after her opponent Polona Hercog retired due to injury. The second seed can top the rankings if she matches or betters what Serena Williams does at the event.

Other results saw  last year's runner-up Roberta Vinci grab a straight sets win. Third seed Garbine Muguruza  battled back from a set down to beat Elise Mertens. And former world number one Caroline Wozniacki beat home favourite Taylor Townsend in three sets.