SI.com identified the five best and five worst owners in each of the four major team sports. The method was not scientific but based on numerous factors, some of which are indisputable and some of which are intangible. Among the criteria used to evaluate owners was the willingness to spend money to improve the team; the stability and capabilities of the front office and management; the amenities at the team's venue; and the club's culture and interactivity with fans. Of course, weighing heavily in the decision was the team's success or failure on the field. (Note: Records are through 2008-09 regular season.)