Zheng is in the quarterfinals of the US Open after a record finish at 2:15 a.m.

Record: Zheng Qinwen celebrates (JAMIE SQUIRE) China’s Zheng Qinwen reached the quarterfinals of the US Open for the second time with her victory over Donna Vekic at 2:15 a.m. on Monday. This was a record for a women’s match. Zheng,…