After Cardinals reliever Trevor Rosenthal gave up two runs in the eighth allowing the Red Sox to tie the game at four, neither team was able to put away the game in regulation.
The Cardinals got a man on in the bottom of the eighth, but pinch hitter Randal Grichuk was called out on strikes to strand the runner. Closers Seung-hwan Oh and Craig Kimbrel pitched 1-2-3 ninth innings for their respective teams.
Dexter Fowler and Matt Carpenter each hit fly balls to the warning track in the ninth, potentially looking like walk-off home runs off the bat, but Jackie Bradley Jr.