It was leather over pig skin Sunday night.

The Yankees ALCS pennant-clincher on Fox is expected to have drawn a bigger audience than the Giants game on NBC, when final numbers are released today.

If so, it would be a rare prime-time victory for Major League Baseball over its NFL rival.

The Yanks’ 5-2 Game 6 victory over LA averaged 15.5 million viewers on Fox (8:17 p.m.-12:03 a.m.), according to “fast nationals” ratings specially ordered by the network.

By comparison, Big Blue’s 24-17 loss to Arizona is expected to average less than 15 million viewers when Nielsen releases official numbers today.

The Yankee game also averaged a 5.2 rating in the coveted (read: young) demo of adults 18-49, up a whopping 49 percent from the last ALCS Game Six in 2007 (Red Sox-Indians).

The Bronx Bombers were also victorious in New York on a night that divided local sports fans’ loyalties.

The Yankees averaged nearly 3 million viewers on Ch. 5 — tripling the 1 million viewers who watched the Giants on Ch. 4, according to Nielsen.