For one thing, you're only accounting for batting WAR for each team. If you add Boston's pitching WAR (7) you get 22.6 for the team. If you add the Twins' team pitching WAR (10.7), you get 18.1 for them. Second thing, team WAR isn't intended to match up perfectly with team win-loss record (which shows past performance only), it's meant to fall roughly in the range between team record and pythagorean record (which is a function of runs scored and allowed, and which is a better predictor of future performance.) Pythag W%=[(Runs Scored)^1.81]/[(Runs Scored)^1.81 + (Runs Allowed)^1.81] If you plug that in for Boston (.450) you'd expect their team WAR total to fall somewhere in the range of 52 team wins and 53.1 pythag wins. B-Ref sets replacement level at .320 winning percentage (or roughly 38 replacement wins based on 118 games played so far), so if you add Boston's team WAR to that, you get about 60. For Min (.478 pythag = 57 wins compared with their actual 59 wins, and team WAR gives you 56) It's not perfect by any means, but it is useful as a rough tool for comparing the value of different players with a single metric. The Twins are right about where you'd expect them to be as a team based on WAR, and Boston is fairly significantly underperforming theirs, but like any other statistic there are almost always outliers.