The Boston Celtics aren't yet halfway to the NBA record for consecutive victories, a mark the 1971-72 Los Angeles Lakers still hold, but at 15 in a row, they are in rare territory. Since 1946-47, there have only been 35 instances of a 15-game win streak or longer. A victory Monday night against the Dallas Mavericks, who are an NBA-worst 3-14 overall and 2-8 at American Airlines Center, would tie the 1964-65 Boston team's 16-game win streak.