There may never have been a more surreal day in this city’s sports history than June 17, 1994. That afternoon, the Rangers — the Rangers! — rode down the Canyon of Heroes with the Stanley Cup they’d won just three days prior. Then that night, the Knicks took a 3–2 lead in the NBA Finals at the Garden, while O.J. Simpson held a gun to his head in the backseat of a white Ford Bronco being followed by cops on the freeways of Los Angeles — and by news helicopters from above. (Also happening that Friday afternoon: The 1994 World Cup opener in Chicago, and Arnold Palmer’s last round of U.S. Open golf.) Brett Morgen’s documentary June 17, 1994 chronicles the day (and the Simpson chase especially) using nothing but archival footage artfully edited together and set to music, and it premieres tonight at 10 p.m. as part of ESPN’s “30 for 30” series.