20. Dikembe Mutumbo
Mutumbo is another big man who led a long career in the NBA, playing for six teams over 19 seasons in the league. He became known for his blocking abilities early in his carer, averaging as much as 4.5 per game in 1995 with the Denver Nuggets. He continued to post monstrous numbers in 1999, grabbing 14.1 rebounds and scoring 11.5 points per game that season.