"Edinson Volquez's return to the Reds' rotation will come Sunday against the Colorado Rockies here at Coors Field, where ERAs go to rise.

"This isn't an easy place to pitch in," Reds manager Dusty Baker said.

"It's really a test. This is the one place where you really don't want to walk people."

Walks are one of the big reasons Volquez was sent to Triple-A. He walked 55 in 85 innings with the Reds.

Volquez, 28, aright-hander, did a much better job of throwing strikes at Louisville. He walked 29 in 87 1/3 innings. His strikeout rate was about the same. He struck out 85 with the Reds and 83 with the Bats."