FRISCO, Texas — Mauro Diaz scored and FC Dallas beat the Montreal Impact 2-0 on Saturday night for its fourth straight victory.

Montreal's Matteo Mancuso put Dallas up 1-0 with an own goal in the fifth minute. The ball ricocheted off his head when a teammate attempted to clear Diaz's indirect free kick with his own header.

"We scored an own goal and then a penalty. It was an unlucky night, but we have to do something more to win games for sure," said Mancuso.

Dallas was initially ruled offside on the play, but after video review, the goal stood when Montreal was determined to have made first contact. Diaz scored for Dallas (14-7-1) in the 18th minute on a penalty kick after Maxi Urruti drew a penalty on Rudy Camacho in the box.

"We looked sharp in the first half. We could have scored a few more goals with the chances that we had," said Dallas head coach Oscar Pareja. "In the second half, the ball was with Montreal more. We knew it. We started dragging a little.

Montreal (4-11-0) nearly avoided the shutout when Mancosu banged a shot off the post from the right side of the box at the 50th minute just before halftime. The Impact have scored just once in their last five contests.

"There is a lot of disappointment and frustration in the locker room from my players and from me," said Impact hea coach Remi Garde. "We deserved at least to score a goal, we touched, twice, the bar and the post. We were quite unlucky we conceded two goals on set pieces."