Tim Cahill's stoppage-time winner against the
The Australia midfielder headed a Juninho free-kick past Carlo Cudicini in the 91st minute at Red Bull Arena to stretch New York's advantage over second-placed Sporting Kansas City, who were held to a 1-1 draw at DC United.
Ethan White's 61st-minute own goal looked to have set Sporting on course for victory at RFK Stadium, but Kyle Porter converted a cross from substitute Chris Pontius four minutes later to earn bottom-placed DC a share of the spoils - and end their seven-match losing streak.
Also on Sunday night, Ned Grabavoy started and finished the scoring as Real Salt Lake stormed to a 4-1 success over Chivas USA at the Home Depot Center to climb to second in the Western Conference standings.
Joao Plata's 48th-minute effort doubled the visitors' advantage after Grabavoy's first-half opener and, although Jorge Villafana halved the deficit soon after, further goals from substitute Robbie Findley (78) and Grabavoy (90) sealed an emphatic away win.