Age: 48
Title: Owner, Dallas Mavericks
Pro: Since taking over the moribund Mavs in 2000, he has upgraded the team's facilities and become the most fan-accessible owner in sports. Try him at mark.cuban@dallasmavs.com. The team is an annual favorite to win the championship, and had the NBA's best record this year.
Con: The Mavs stunning collapses the last two post-seasons—blowing a 2-0 lead to the Miami Heat in last year's finals, and falling to the eighth-seeded Golden State Warriors in the '07 playoffs—have fans wondering if Cuban's entertaining teams lack championship toughness.