No. 9: 1986-87

Record: 59-23
Playoff record: 13-10
Result: Lost in Finals
The Iron Man five of Bird, Kevin McHale, Robert Parish, Dennis Johnson, and Ainge did not have sufficient bench support to get by the mighty Lakers, losing the pivotal Game 4 to the storied Magic Johnson "junior, junior sky hook." No Celtic team ever had more sheer heart.