Since 1957, the Celtics have reached the NBA Finals 21 times and won 17 championships.
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The Los Angeles Lakers have beaten the Boston Celtics three times in the NBA Finals: in 1985, 1987 and 2010.
The Celtics won three championships during the 1980s -- in 1980-81, 1983-84 and 1985-86.
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As of June 2010, the Boston Celtics have 17 NBA championships while the LA Lakers have 15. These numbers will change soon as both teams are currently playing in the NBA Finals with another ring on the line.
Lebron James lead Cleveland to 5 consecutive appreances in the playoffs, 2006-2010.