Columbia’s Michael Zheng comes full circle as Americans advance at US Open

Former Ivy League star wins US Open debutShelton and Tiafoe advance to third roundPegula cruises past Kenin in 56 minutesMichael Zheng spent years making the long trek from northern New Jersey, first by bus across the Hudson River to the Port Authority bus terminal and then nearly the full length of the No 7 subway line, all for the opportunity to train at the USTA Billie Jean King National Tennis Center. On a rains…