DENVER (AP) -- Nolan Arenado hit a walkoff homer to begin the ninth inning and the Colorado Rockies beat the San Diego Padres 10-9 on Friday night after squandering a six-run lead.
Arenado sent a 1-1 pitch from reliever Joe Thatcher (2-1) over the wall in left field.
Matt Belisle (4-2) pitched two scoreless innings to earn the win.
Carlos Gonzalez had two triples and drove in three runs before leaving with a left knee injury in the seventh. Dexter Fowler returned to the lineup after sitting out with a migraine and finished with three hits, while Todd Helton drove in three runs.
The Padres trailed by six runs early in the game and 9-4 heading into the seventh. Chase Headley began the inning when he was hit by Rob Scahill, possibly as retaliation for when starter Edinson Volquez plunked Troy Tulowitzki in the second.