Kyle Lowry had 20 points and 12 assists to record his fourth straight double-double as the Toronto Raptors defeated the visiting Dallas Mavericks 116-107 on Friday night.Kawhi Leonard scored 21 points and grabbed nine rebounds for the Raptors, who have won their first six games of the season for the first time in franchise history. They won their first five to open the 2015-16 season.The Raptors also have won their first five home games of the season to match the club record previously accomplished in 2014-15 and 2003-04.The Raptors, who led by as many as 17 points in the first half, had a three-point lead after three quarters. They scored the first seven points of the fourth quarter and regained command of the game.When Jonas Valanciunas put in his own rebound with two minutes to play, the lead was 13.Valanciunas finished with 17 points and eight rebounds for Toronto, Danny Green added 15 points and eight rebounds, Serge Ibaka had 11 points and eight rebounds and C.J. Miles and Pascal Siakam each scored 10 points.Luka Doncic scored 22 points for the Mavericks, who have lost two in a row. Wesley Matthews added 21 points for Dallas, followed by DeAndre Jordan (18 points, 15 rebounds) and Harrison Barnes (14 points).The Raptors led 18-2 before Jordan made two free throws with 6:07 left in the first quarter. Toronto had a 39-26 advantage after the opening quarter, with Green topping the scorers with 12 points.Barnes, making his season debut after being out with a strained hamstring, scored six first-quarter points for Dallas.The Mavericks cut the lead to five with 5:21 to play in the second quarter on Jordan’s tip dunk.After Lowry’s driving layup, Matthews hit a 3-pointer for Dallas at the buzzer and Toronto led 69-60 lead at halftime on 53 percent shooting.Lowry made three straight baskets in a 7-2 run to give Toronto an 81-64 lead with 8:07 remaining in the third quarter.Jordan’s tip-in trimmed Toronto’s lead to three points with 4:02 left in the quarter. Dallas got within one before the third quarter ended with Toronto leading 92-89 after Norman Powell’s layup.