Twenty-five of MLB's 30 teams have won at least one World Series. Five franchises have yet to hoist the Commissioner's Trophy: the Colorado Rockies, Milwaukee Brewers, San Diego Padres, Seattle Mariners and Tampa Bay Rays.

It's hard, you know -- repeating as the champions of a sport. This is the case for any athletic pursuit, and it's probably fair to say it's especially difficult in baseball, which has so much structural randomness and a related knack for defying expectations.