Day 1 of the U.S. Open saw Simona Halep become the first ever no. 1 seed to lose in the first round, while Stan Wawrinka overcame Grigor Dimitrov in a brutal first round draw for both. Jason Kubler claimed "story of the day" rights, while young Canadians Denis Shapovalov and Felix Auger Aliassime faced off for the first time on a big stage. We recap it all before previewing day 2's matches to watch. Tune back in tomorrow!