Zlatan Ibrahimovic scored a penalty in the first half and Diego Polenta won it late for the Galaxy as they beat the Houston Dynamo 2-1. Defender Diego Polenta headed in the winning goal in the 88th minute to lift the Los Angeles Galaxy to a 2-1 victory over the Houston Dynamo on Friday night at Carson, Calif. Forward Zlatan Ibrahimovic also scored as the Galaxy (6-1-0, 18 points) continued their strong start. Forward Alberth Elis scored for the Dynamo (4-1-1, 13 points), who fell from the ranks of the unbeaten.