The announcement was made two minutes before the game was
scheduled to start and the game's start was pushed back to 2:15
p.m. ET. Fernando Nieve was scheduled to start in his place.
Oswalt left his last start May 29 with a tight hamstring, but
had recovered from that injury and was in the lineup Sunday.
Oswalt said his back began bothering him two days ago and that
it worsened when he was warming up before the game. He said he
threw about 20 pitches when he realized he wouldn't be able to
"It felt like somebody hit me in the back," he said. "I've
never had back problems so I don't know what to expect with this."
Astros manager Phil Garner said he doesn't expect Oswalt to go
on the disabled list, but that team doctors will be monitoring his
"I've just got to get it well and we'll go from there," Oswalt