Coco Crisp was the hero for the second night in a row as the Oakland Athletics kept their season alive with a 4-3 win over the Detroit Tigers.
At 2-1 down in the five-game American League Divisonal Series and 3-1 down heading into the ninth inning, Oakland were three outs away from elimination.
But Josh Reddick singled off Tigers closer Jose Valverde, Josh Donaldson doubled and Seth Smith followed suit to tie the game up at 3-3.
Valverde then secured two quick outs but, with the game seemingly headed to extras, Crisp, who scored and made a spectacular catch in Tuesday's victory, singled to drive home Smith and win the game for the A's.
Oakland will have homefield advantage again for the decider.
Raul Ibanez stepped off the bench to hit two home runs - one to tie the game and one to seal a walk off 3-2 win - as the New York Yankees went 2-1 up on the Baltimore Orioles.
Ibanez pinch hit for Alex Rodriguez in the ninth and homered to send the game into extras, then repeated the trick in the 12th.
Angel Pagan hit a lead-off home run and Tim Lincecum earned the win in relief as the San Francisco Giants ensured their National League Divisional Series with the Cincinnati Reds would go to game five with an 8-3 win.
Gregor Blanco and Pablo Sandoval also homered for the Giants, who got 4 1/3 innings of one-run relief out of Lincecum after starter Barry Zito had struggled.
Chris Carpenter earned the win for the St Louis Cardinals as they moved 2-1 ahead in their NLDS series against the Washington Nationals with an 8-0 win.
Carpenter, who pitched only 17 innings in regular season play because of injury, hurled 5 2/3 scoreless innings, while there was another unlikely hero in unheralded utility man Pete Kozma, who smacked a three-run homer in the second.
