Norris was dealt from the Houston Astros to the Orioles on Wednesday, and he'll make his first start for Baltimore on Thursday night against the club that drafted him.
Baltimore (59-49) sent outfielder L.J. Hoes and left-handed prospect Josh Hader to the Astros (36-70) for Norris, a 28-year-old right-hander.
"We've been trying to bolster our pitching staff, and in Bud Norris we have a pitcher that can give us some quality innings," said Dan Duquette, Orioles executive vice president of baseball operations. "He's been a very dependable pitcher for Houston over the course of his career."
The Astros and Orioles were in the middle of a three-game series as the non-waiver trade deadline expired. So Norris packed up his gear and made his way a few hundred yards through the bowels of Camden Yards to the home clubhouse to begin the next chapter of his big league career.
In the process, he left the team with the worst record in the majors to a club seeking a second straight trip to the playoffs.
"I'm excited for the future," Norris said. "I pitched my way into this situation to be traded and help out a team. This (Baltimore) team is a young club, they know how to contend. They had an amazing year last year. I just want to be any piece of the puzzle I can to help this team keep pushing to the World Series."
In his fifth big league season after being picked by the Astros in the sixth round of the 2006 draft, Norris is 6-9 with a 3.93 ERA in 21 starts this year. He has a lifetime record of 34-46, going 13-28 with a 5.46 ERA outside of Houston.
"He's competitive, a strike-thrower. He has a nice approach," Orioles manager Buck Showalter said. "He's been healthy, and he competes. I like that fact that he gets after it. He'll have some challenges ahead of him, but he's not the only guy that's got to do well for us to be more competitive."
Norris was the third pitching addition the Orioles made via trade in July; previously they obtained Scott Feldman and Francisco Rodriguez.
"I really thought once they got Scott Feldman my chances went down," Norris said. "But obviously we got a couple guys now."
Scratched from his scheduled start Tuesday, Norris is ready to take the mound for Baltimore.
"I'm pretty fresh," said Norris, who hasn't pitched since July 24.
Hoes was one of the Orioles' top prospects. A third-round pick in 2008, Hoes was hitting .304 for Triple-A Norfolk before being recalled Sunday by the Orioles.
He was in Baltimore's starting lineup Wednesday. Then, after the trade, Hoes was inserted into Houston's starting lineup. Hoes went 0 for 5 with two strikeouts, but he and his new teammates enjoyed a rare 11-0 laugher as the Astros won for the sixth time in 27 games.
"It's not every day that you show up to a major league ballpark and look at the opposing team's lineup and see someone in the lineup playing left field for that team, then an hour later he's been traded and is now on your team and is playing right field," Houston manager Bo Porter said.
For the Astros, the rebuilding process continues.
"Whenever you lose your opening day starter, and a guy that's been our best pitcher all year, it's definitely a blow to the ballclub," Porter said. "I think we have enough young pitching in our organization that we feel comfortable moving forward that we can replace those starts the rest of the year."
Jordan Lyles (4-4, 4.92 ERA) gets the nod for the Astros as they try to win two in a row for the first time since a four-game run June 12-16. The 22-year-old right-hander is 0-3 with an 8.13 ERA in his last six starts, with the Astros losing each game.
Lyles, who went 4-1 with a 3.22 ERA in his first 10 outings, has never faced Baltimore.