The most-watched RSN last season was Fox Sports Detroit, which averaged an 8.58 household rating per telecast. Among household ratings, ranking behind Fox Sports Detroit were ROOT Sports Pittsburgh (Pittsburgh Pirates) at an 8.49; Fox Sports Midwest (St. Louis Cardinals), 8.23; Fox Sports Kansas City (Kansas City Royals), 7.25; SportsTime Ohio (Cleveland Indians), 6.68; MASN/MASN2 (Baltimore Orioles), 6.25; Fox Sports Wisconsin (Milwaukee Brewers, 5.8; Root Sports Seattle (Seattle Mariners), 5.71; CSN Bay Area (San Francisco Giants, 4.86; and NESN (Boston Red Sox), 4.85.
via Broadcasting & Cable (click the link for lots more local ratings info for 2014 than was included above)
We hear a fairly constant stream of dismay at baseball’s national ratings woes. But with practically every game televised locally, fans of the home team have little need to watch the national games. Baseball is on much-better-than-solid footing locally where, according to the linked article, MLB games in primetime are the top-rated, most-watched programming in 11 markets.