The Padres might not be finished paying a price for the 10-inning loss at Coors Field on Sunday. Rookie second baseman Jedd Gyorko left the game with a right groin injury of undetermined severity in the middle of the 10th inning. Gyorko said he was hoping it was a cramp. But the injury will be re-examined Monday and the Padres are fearful it could be worse. “We’re not sure what it is,” said Padres manager Bud Black, “a strain, a pull, a cramp. But he had to come out of the game.” “Hopefully, it’s just a cramp,” said Gyorko, who seemed to be walking without much discomfort in the clubhouse after the game. “When I got to the dugout, it spasmed up pretty bad.” Gyorko suffered the injury on his last step before sliding into second on a force play in the top of the 10th. He will be re-evaluated in San Diego Monday. A strain could place him on the 15-day disabled list next to first baseman Yonder Alonso (broken third metacarpal bone in his right hand). Gyorko has hit safely in 13 of his last 14 games, going 20-for-61 (.328) with five doubles, three homers and nine RBIs. Over his last five games, Gyorko is 9-for-23 with three doubles, two homers and four RBIs. He is hitting .330 (34-for-103) since May 14 with eight doubles, five homers, 13 RBIs and 23 runs scored. Gyorko leads the Padres with eight homers and is second to Alonso with 25 RBIs. Headley rests When Gyorko came out of the game for the bottom of the 10th, Chase Headley came in with Alexi Amarista moving from third to second. For the first time since he returned from the disabled list on April 17, the slumping and aching Padres third baseman didn’t start Sunday. Headley, who missed the start of the season with a fracture to the bone at the tip of his left thumb, had made 48 straight starts until Sunday. “This was a good day for Chase to step back and watch a game,” said Black. “Some of his at-bats over the last week have not been indicative . . . he plays so hard physically and mentally.”