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The Toronto Raptors had to rally late and work overtime Friday to stretch their NBA winning streak to 11 games with a 122-115 victory over the Dallas Mavericks. The Eastern Conference-leading Raptors, who needed a fourth-quarter surge to beat the Indiana Pacers on Thursday, looked to be feeling the effects of their second game in as many days in the early going. But DeMar DeRozan came through with 29 points, including a short jump shot with 53.