"He threw his fastball down in the zone, had a good changeup, threw some good sliders. ... That's a Rich Harden type of game," Rangers manager Ron Washington said.
Washington wouldn't say whether Harden, who was placed on the disabled list on Sunday and is eligible to return Monday, would need another Minor League start. The Rangers have yet to announce a starter for Monday's home game against Minnesota.
"It's nothing I want to talk about right now," Washington said. "We're still in the process of processing it. I think in the next day or so we'll have a decision."
Injured catcher Matt Treanor made his second rehabilitation appearance for Oklahoma City on Wednesday and caught seven innings. Treanor was placed on the 15-day DL on July 24 with a strained posterior cruciate ligament in his right knee.
"He's going to catch nine [innings] and see if we can get him nine back-to-back [this weekend]," Washington said of Treanor. "If we get him nine back-to-back and everything is fine, then we've got a decision to make. But we've got to get him nine back-to-back."