Goodbye, Milos Raonic. Too bad the U.S. Open didn't get to see you at your best.
Canada's star and the fifth seed at Flushing Meadows, Raonic succumbed to cramping and was not able to save himself against Ryan Harrison, an unseeded American.
Will Steve Johnson join the list of upset victims? That's possible, given his Thursday match is against Juan del Potro. Stan Warwrinka also plays on Thursday, in a second-round match expected to begin about 5:30 p.m. ET.
Andy Murray, seeded second, has an early match against Spain's Marcel Granollers. Expect that to begin about 1 p.