 An NBA Finals rematch in name only takes place this afternoon in Las Vegas. The Boston Celtics and Dallas Mavericks tip off from the Pavilion in Las Vegas as the NBA Summer League continues. The Celtics have improved their exhibition record so far this summer to 2-1. And the New England Revolution are back on the MLS pitch tomorrow night. The club kicks off against FC Dallas at Gillette in Foxborough. New England has lost three straight and is last in the East with 22 points.