Lassi Lappalainen and Orji Okwonkwo both scored twice as the Montreal Impact ended a four-game losing run with a 4-0 win over the MLS-leading Philadelphia Union.

Mike Magee bagged a hat-trick and Republic of Ireland striker Robbie Keane struck late as the defending-champion Los Angeles Galaxy began their MLS season with a 4-0 win over the Chicago Fire.