Kelly's bases-loaded shot broke a 4-4 tie and sends the series to Oakland on Tuesday for game three, the A's facing elimination. Kelly scored the tying run on a wild pitch after being put in to run for Delmon Young in the eighth.
ALDS: NY Yankees 7 Baltimore 2 - C.C. Sabathia got all but the final out, working 8 2/3 innings in the opener of the ALDS in Baltimore.
After the Orioles took a 2-1 lead, the Yankees tied the game on Mark Teixeira's single in the fourth, scoring Alex Rodriguez. Russell Martin opened the top of the ninth with a solo homer and the Yankees pild on four more runs in the innings, breaking a tight game wide open.
The series resumes Monday at Camden Yards at 8:07 pm EDT.
Gio Gonzalez was erratic for the Nationals, but, despite walking seven batters, he allowed only one over five full innings. The Cardinals scored their two runs in the third inning, on a wild pitch and a sac fly.
Game two is set for Monday at 4:37 pm EDT. Washington sends Jordan Zimmermann to the mound to face the Cardinals' Jaime Garcia.
Arroyo worked a perfect game into the fifth inning, giving up a two-out single to Brian Belt. His only other flaw was a two-out walk to Buster Posey in the seventh inning, before finishing up the frame by getting Hunter Pence on a harmless fly ball.
Ryan Hannigan drove in three runs with a pair of singles to pace the Reds' offense. San Francisco got only two hits off Arroyo and a pair of relievers.
Cincinnati will host game three on Tuesday, at 5:37 pm EDT and will also be the site of games four and five, if necessary.