This was no time for a lapse in Concentration, yet distractions were everywhere.

A frenzied Stadium crowd of 56,136 was mocking Pedro Martinez, serenading him with New York’s favorite new jeer. “Who’s Your Daddy? “Who’s Your Daddy?”

“It’s fun to play here,” Derek Jeter said last night after Game 2 of the ALCS. “We have some intelligent fans.”

Martinez, who hasn’t met a batter he won’t throw out, stared in. Jeter, who always wants to be the aggressor, dug in but he didn’t bug out.

Jeter was patient. He waited to see if Martinez could find the strike zone. Four pitches, four balls and “Captain October,’ as one sign read, was standing on first.

“I still wanted to be aggressive but he didn’t throw a pitch over the plate,” said Jeter. “I went up there looking for a specific pitch and when I didn’t get it, I was ready to wait.”

On Martinez’s first pitch to Alex Rodriguez, Jeter stole second. Jason Varitek’s throw beat him to the bag put Jeter slid head-first into Mark Bellhorn’s glove. The ball popped out in between Jeter’s legs.

I wanted to be aggressive and score early,” said Jeter. “I made up my mind I was going on the first pitch.”

Just as Jeter made up his mind he was tagging and going home in the 12th inning of the Game 2 7-6 win over Minnesota. He imposes his will on the game.

They would go on to win 3-1 and lead the series 2-0. Playing in his 105th postseason game, Jeter scored his 74th run.

As Boston’s Kevin Millar said prior to Game 1, “Why he raises his level this time of the year, I don’t know how. “But the great ones always do.”

This is Jeter’s legacy. Captain October is on a mission.