HARRISON, N.J. — When his team first came together in February, New York Red Bulls coach Mike Petke wasn’t sure what he had in goaltender Luis Robles.Seven months later, Petke knows: A goaltender who can win games. “In a goalkeeper, you expect him to come up with one huge save a game, a game-changing save. And Robles has done that if not more than that, so I’m very happy with where he’s at,” Petke said after Robles recorded his 10th shutout of the season, leading the New York Red Bulls to a 1-0 win over FC Dallas on Sunday. Robles, who is tied with five other goaltenders for the MLS lead in shutouts, made two saves to help New York to its fourth straight victory.The Red Bulls improved to 15-9-6 with a league-leading 51 points. They have four games remaining in the regular season. FC Dallas midfielder Erick accidentally kicked New York midfielder Jonathan Steele’s crossing pass into the FC Dallas net in the 76th minute for the game’s only goal.“It was a really fast play,” Dallas midfielder David Ferreira said. “Erick wanted to clear the ball and unfortunately he ends up putting it in our own net.” Raul Fernandez made one save for Dallas (10-9-10), which has five games remaining and is three points out of the final Western Conference playoff spot. The shutout was the seventh of the season for Dallas.