On July 13, 2010, Chandler was traded, along with Alexis Ajinça, to the Dallas Mavericks in exchange for Erick Dampier, Eduardo Nájera, Matt Carroll and cash considerations. Chandler was the perfect fit during his first season with the Mavericks, anchoring their defense on a team with Dirk Nowitzki, Jason Terry and Jason Kidd. He was credited with giving the Mavericks the 'toughness' and defensive intensity that they sorely lacked, earning selection to the NBA All-Defensive Second Team for his efforts. He helped them reach the 2011 NBA Finals, where they faced the Miami Heat. In Game 4 against the Heat, with Nowitzki under the weather and ailing backup center Brendan Haywood unable to stay in the game, Chandler had 13 points and 16 rebounds in an 86–83 win that tied the series at 2–2. He grabbed nine offensive boards, with eight coming after the first quarter. The Mavericks went on to defeat the Heat in six games, with Chandler winning his first and so far only championship.