That was more than 10 months ago when he was with the Orioles.
On Wednesday, Millwood, 36, will get another chance to show his stuff, this time against the Reds. The 14-year veteran recently opted out of the Red Sox organization after pitching well at Triple-A Pawtucket and signed with Colorado. He was inserted into the Rockies' rotation after the neck injury to Juan Nicasio.
The Reds will counter with Mike Leake.
"This kind of came out of nowhere for me," Millwood said. "I had heard a little bit about this becoming a possibility on Saturday. Then I left Sunday to go home and that's kind of when it all happened. I was going home to Gainesville, Ga., about an hour north of Atlanta. I was going home and living my life. I kind of had come to the point where I was OK with it."
Millwood signed a Minor League deal with the Yankees in March, then opted out in May. He signed with the Red Sox a few weeks later. Overall, the right-hander went 7-2 with a 4.32 ERA in 16 starts in the Minors this season.
"I feel like I've located the ball pretty well, and I feel like my offspeed pitches have been good," he said. "It's a different level down there, but you try to take it serious and try to win games. But it's a different animal than this league."
For his career, Millwood is 159-137 with a 4.11 ERA in 414 games. He went 4-16 with a 5.10 ERA for the Orioles last year.
"It's going to be exciting, no doubt about it, to be back in a ballpark with a third deck," Millwood said. "Just to be back to the game that I've been in for 14 years. I'm really excited about it."
Leake allowed three runs on six hits with three walks over six innings in a loss to the Cubs in his last start. He has recorded a quality start in each of his last four outings, but has lost three of those games.
Rockies: Tulowitzki getting hits in bunches
Troy Tulowitzki had racked up five consecutive multihit games before going 1-for-3 with a two-run homer on Tuesday. He still has multiple hits in 13 of his last 22 games.
Ty Wiggington is 8-for-21 (.380) with a home run, three runs and three RBIs in his last six starts.Reds: Cairo one hit away from milestone
Miguel Cairo needs one hit to reach 1,000 hits for his career and become the 1,212th player in history to reach the mark.
The Rockies lead the all-time series against the Reds, 78-73.
The start time for the matchup between the Reds and the Pirates on Aug. 20 has been changed from 7:05 p.m. ET to 4:11 p.m. to accommodate the FOX national broadcast.
Cincinnati's Brandon Phillips played in the 1,000th game of his career Tuesday.