Jorge De La Rosa, who is recovering from Tommy John surgery last June, threw three shutout innings Wednesday for Rookie-level Grand Junction. He allowed three hits and struck out five. De La Rosa threw 49 pitches, and Tracy said the left-hander's fastball sat at 91 mph and touched 94 mph.
"That was really encouraging news last night after a very tough loss," Tracy said.
Meanwhile, Troy Tulowitzki played five innings in a rehab assignment at Double-A Tulsa on Wednesday. Tulowitzki went 1-for-3 and started a double play in Tulsa's 8-6 loss to Springfield in the first game of the Texas League playoffs.
The shortstop has been on the disabled list since May 30 with a strained left groin that eventually required surgery to remove scar tissue.
Tulowitzki will play seven innings at shortstop Thursday night with Tulsa. Where he and De La Rosa go next has yet to be determined and will depend on how the Rockies' Minor League affiliates perform in the postseason. All three clubs that made the playoffs lost Wednesday night and are on the brink of elimination.