The AP reports: Paul Pierce reached over and gave Kevin Garnett a hearty slap on the back as they laughed off the suggestion that now, with virtually everything going right, would be a good time to buy a lottery ticket. “I’ve got a lottery ticket already,” Pierce said after watching Garnett score 23 points and help shut down Dirk Nowitzki to lead Boston to its eighth straight win, 124-100 over the Dallas Mavericks… Reserve Eddie House also scored 23—including seven 3-pointers—and Ray Allen scored 20 of his 23 points in the first half as the Celtics opened a 27-point lead and coasted to their sixth straight double-digit victory… Jason Terry scored 27 for the Mavericks, who have won just three of their last nine games. Nowitzki had 18, but the Dallas 7-footer shot 4-for-17 from the field and had the ignominy of having his shot blocked by the 6-foot-1 House in the second quarter… Rajon Rondo had 13 points and 14 assists for the Celtics.