39. Dikembe Mutombo
It is well-known by now that Dikembe Mutombo is one of the greatest centers in NBA history. However, he sadly never won a ring despite the statistics that make many believe he should have. Mutombo was mostly known for his defense over offense. He won the NBA Defensive Player of the Year award 4 times in his career. He landed on the All-NBA Defensive First Team 3 times and the Second Team 3 other times.
Mutombo led the league in rebounds twice and even led the league in blocks for three years in a row (1994-1996). Dikembe was also an 8-time NBA All-Star. While not known for his offense, Mutombo could score. He averaged 10 or more points a game every year from 1992 to 2002, in fact. Though Mutombo is one of the best players who never won an NBA Championship, he did play once in the NBA Finals as part of the Philadelphia 76ers.