NBA centers have always been a rare commodity. You'll be hard-pressed to find a great big man on a bad team. That's because many championship squads value defense and rebounding. NBA anchors usually come in waves. In today's game, we have Dwight Howard, Andrew Bynum, Brook LopezTyson Chandler, Roy Hibbert, and Marc Gasol. In the '90s, there was David Robinson, Patrick Ewing, Dikembe Mutombo, and Hakeem Olajuwon. And let's not forget the originators in George Mikan, Bill Russell, Wilt Chamberlain, and Kareem Abdul-Jabbar. So as we honor Hakeem the Dream's 50th birthday that he celebrated earlier this week, check out the 25 Greatest Centers in NBA History.

Written by Angel Diaz (@graffnameramo)