These are the most focused rivalries in the league,
as determined by the aggregate rivalry score (points of A->B + points of B->A).

Giants 152.65 Dodgers
Red Sox 142.96 Yankees
Cubs 114.42 Cardinals
Nationals 91.81 Braves
Indians 82.93 Tigers
Phillies 66.68 Mets
Diamondbacks 64.83 Dodgers
Reds 63.65 Cardinals
Rays 59.88 Red Sox
White Sox 59.59 Cubs

One team's fans may see another team as a rival, but it isn't always reciprocated.
This list shows the largest gaps in Rivalry Score between two teams.

61.00 Diamondbacks 57.20 Dodgers 3.80
54.85 Brewers 50.58 Cardinals 4.26
49.85 Padres 47.31 Dodgers 2.54
47.03 Orioles 41.44 Yankees 5.59
40.96 Rockies 39.79 Giants 1.18
49.26 Rays 38.64 Red Sox 10.62
51.04 Reds 38.43 Cardinals 12.61
35.94 Royals 32.92 Cardinals 3.01
33.73 Blue Jays 31.51 Red Sox 2.22
33.81 Rays 30.81 Yankees 3.00