The Boston Red Sox have been in the playoffs 20 times since 1901(when Baseball started having leagues and championships).
Counting the AFL, the Patriots appeared in the playoffs in 16 different seasons, one in the old AFL as the Boston Patriots, and the rest in the NFL.
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The Boston Red Sox won 9 games against the New York Yankees in 2009, and lost 9.
The past 30 years would be from the 1980 season. The Steelers made the playoffs 17 times since 1980.
15 times
The Jacksonville Jaguars have Been to the playoffs once.
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They have been to the Stanley Cup finals 4 times and countless playoffs.
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The Miami heat been in the NBA playoffs 4 times
27 times
The Boston Celtics have beaten the Miami Heat 66 times; 58 times in the regular season, and 8 times in the playoffs
Through the 2012 season, the San Diego Chargers made the playoffs 17 times.
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