DENVER -- Rockies manager Walt Weiss announced officially that left-hander Drew Pomeranz will be called up from Triple-A Colorado Springs to start Sunday afternoon against the Giants.
Pomeranz will take the rotation spot of Juan Nicasio (4-4, 5.31 ERA), who was sent down to Colorado Springs on Friday. Nicasio was replaced on the active roster by closer Rafael Betancourt, who is returning from a right groin strain, so the Rockies will have to make another move Sunday.
Pomeranz is 8-1 with a 4.20 ERA in 15 starts for the Sky Sox, but the last two starts have earned him the promotion. After having his effectiveness muted by high pitch counts early in the year, Pomeranz held Las Vegas to no runs and three hits with 11 ground-ball outs in 6 2/3 innings on June 16, then held Tacoma to two runs and five hits in seven innings on June 21.
It represents another chance for Pomeranz, 24, to meet the high expectations that came with being acquired from the Indians for former Rockies ace Ubaldo Jimenez in 2011. Pomeranz went 2-9 with a 4.93 ERA in 22 big league starts last year. He also had nine starts at Colorado Springs.
"He's put together a nice year down there and the last couple of times out have been real good," Weiss said. "Looks like he's been efficient. He's got a good arm. There's deception, some finish to his stuff. He's done a nice job ironing some things out the first months down there."
Thomas Harding is a reporter for MLB.com. Read his blog, Hardball in the Rockies, and follow him on Twitter @harding_at_mlb. This story was not subject to the approval of Major League Baseball or its clubs.