It was the first time the dual feat has happened since Oct. 19, 2009, when the Angels' Jeff Mathis walked off against the Yankees in Game 3 of the ALCS, and Jimmy Rollins followed later that night by winning Game 4 of the NLCS for the Phillies against the Dodgers.
Wednesday was also the first time in Division Series history that two teams rallied from a deficit heading into the bottom of the ninth inning.
For the Yankees, it took three more innings to seal the deal, as Ibanez clubbed a ninth-inning long ball to tie it before his 12th-inning second-decker sent the Yankee Stadium crowd into a frenzy.
Crisp and the A's wasted no time completing their comeback. Three batters after Seth Smith tied the game with a two-run double, Crisp won it with a liner to right to cap another improbable victory in an improbable season for Oakland.
The second walk-off may have created a bit of rare history for Major League Baseball, but those victories are nothing new for the 2012 A's.
"We've been doing this all year, you know," a soaked and pie-splattered Coco Crisp said after the game. "We get those [Gatorade] buckets on us, get the pie in the face, it's an awesome feeling. I'm glad that opportunity was there for me to be able to do it."
Ibanez offered a very similar response, describing a team victory and how he just happened to be in the right place at the right time.
"I'm blessed to have the opportunity to come up like that," Ibanez said. "We do it together. It's about the team, and it's about winning."
The double walk-off also happened in the 2007 Division Series (Manny Ramirez and Travis Hafner), 2004 Championship Series (David Ortiz and Jeff Kent), 1998 LDS (Chipper Jones and Bill Spiers), and 1986 LCS (Bobby Grich and Lenny Dykstra).
Overall, Crisp's hit was the 33rd walk-off in Division Series history, and the sixth Division Series walk-off for a team on the brink of elimination.
Earlier in the series, Detroit's Don Kelly hit a sacrifice fly that sent Detroit to Oakland up two games to none. That, combined with Wednesday's heroics, makes three walk-offs in Division Series play this year -- the sixth time in history that has happened.
There has never been a year that saw four Division Series walk-offs, however.
With four games on the slate for Thursday and two that could be played Friday (provided the Orioles and Nationals force a Game 5), there's plenty of baseball still to be played, folks.