On July 15, 2010, Miller signed a five-year $25 million contract with the Miami Heat. He injured his thumb while guarding LeBron James in practice during the pre-season, sidelining him for several weeks. Miller officially returned to the Miami Heat lineup on December 20, 2010, in a home game against the Dallas Mavericks. Miller got his first start on January 22, 2011, due to a Dwyane Wade illness, and contributed with a season-high 32 points in a win over the Toronto Raptors. Miller averaged just 2.6 points a game in 12 minutes a game during the playoffs, with a high of 12 in game 4 against the Chicago Bulls. Miller made his first career NBA Finals appearance in the 2011 NBA Finals, which the Heat lost to the Mavericks 4–2.