NZ payTV will feature the ESPN Sunday nighter. On the season as a whole, NZ payTV games have gone 42-21-4 to Under (31.3% payout rate for the Over). The real split of note is what league rules the game featured has been played under...
AL ruled games have gone 13-11-1 to Under
NL ruled games have gone 29-10-3 to Under (the last 16 of these have gone 14-2 to Under).
I decided to dig into that rather sizable NL mark and I belatedly found the key to all this Under BS. There are 3 culprits: the Mets, the Cubs & the Cardinals. These 3 teams have combined to produce a 21-4-2 Under mark out of the overall 42-21-4 mark (games involving any of those 3 teams playing the other I made sure not to count twice). That means games not involving any of those 3 teams have manifested a far more normal looking 21-17-1 to Under season record.
The Mets have fashioned a 9-1-1 Under mark when featured on NZ payTV, so they're actually an Over team - o/u 38-35-4 - when they've escaped exposure Down Under.
The Cubs have fashioned a 9-2-1 Under mark when featured on NZ payTV, so they're barely an Under team - o/u 33-36-6 - when they've escaped exposure Down Under.
The Cards have fashioned a 9-3-1 Under mark when featured on NZ payTV, so while they've still got a solid Under record - o/u 31-42-3 - when they've escaped exposure Down Under, it's still not as bad when such games are included.
The point, of course, is the Cards feature as one of the 2 teams in the ESPN Sun. nighter. Fwiw: ESPN Sun. night games not featuring the Yankees have gone 9-1 to Under this season (with not a single one totaling between 7-11 runs).