Actually, the Cubs have had the toughest schedule so far. http://espn.go.com/mlb/stats/rpi/_/sort/sos worth mentioning that this early, the fact that those teams have played us plays a big role in putting them there because, correct me if i'm wrong, but part of the RPI calculation for SOS involves the quality of the opponents of your opponents Well the RPI itself weighs that. But simply the SOS column should be the combined winning percentage of all opponents. EDIT: Well, maybe you're right.