Both series will be played over two legs, home and away, with away goals counting as the first tiebreaker. The first legs will be played on Sunday; the second legs will be played next Thursday.
First leg: Sunday, 5 p.m. at Mercedes-Benz Stadium, Atlanta (ESPN and ESPN Deportes, ESPN.com/Watch)
Second leg: Thursday, 7:30 p.m. at Red Bull Arena, Harrison, N.J. (Fox Sports 1, Fox Deportes, FoxSportsGo.com)
1. Atlanta's explosive offense vs. New York's stingy defense. It's simplistic to say, because New York's attack and Atlanta's defense both have some bite.