Uehara hasn't thrown off the mound since March 18, when he left an exhibition game against Toronto with hamstring tightness. The Japanese native has been slow to recover from the injury, and conceded Monday that he won't be ready for the April 6 opener against Tampa Bay.
"I'm not that disappointed," Uehara said through an interpreter. "The more important thing is to be ready physically."
Uehara, 34, starred in Japan before coming to Baltimore last season. He strained a hamstring during spring training, went on the disabled list May 23 with another hamstring injury and did not pitch after June 24 because of right elbow tendinitis.
He went 2-4 with a 4.05 ERA in 12 starts.
The Orioles opted to move the right-hander to the bullpen this season, in part because they hoped he could avoid injury with shorter performances. But his spring training ended during his sixth appearance, the only one in which he yielded a run.
Manager Dave Trembley said Uehara would have to begin throwing on the side by Wednesday to have a shot at being on the Opening Day roster. Uehara said he would not be ready by then.
Told that would force him to the disabled list, Uehara replied, "If it happens, there's nothing I can do about it."
Meanwhile, Trembley said Kevin Millwood would be Baltimore's Opening Day starter against the Rays. The announcement came as no surprise; Millwood has far more experience than any starter and was obtained in an offseason trade with Texas to head the rotation.
"It was an obvious choice for us. An experienced guy, a guy that we're counting on to set the tone for us not only on opening day but throughout the season," Trembley said. "He's a guy that brings a lot more to the table than just the ability to pitch."
It will be Millwood's seventh Opening Day start. He got the call four times with Texas and twice with Philadelphia.
"It's definitely an honor," he said. "I don't know that it says you are better than anybody else. But it's definitely a big deal for a team to name you that."
Working on Opening Day, he said, is always a different experience.
"It's always an exciting day. There's a lot of stuff going on and the game seems to never start on time," Millwood said. "It's probably a little more fun than most starts, but I get pretty nervous every start so in that regard it's pretty much the same."
Copyright 2010 by The Associated Press
MORE MLB HEADLINES
- Cards 3B Carpenter signs $52 million deal
- Royals name Shields as Opening Day starter
- Cardinals' Garcia to see Dr. Andrews again
- No extra replay in place for Australia games
MOST SENT STORIES ON ESPN.COM
- Extended Sizes - Majestic Men's Authentic Baltimore Orioles Chris Davis #19 Cool Base Alternate Orange Jersey w/ Patch
- MLB Home
- AL East
- Baltimore Orioles
- Boston Red Sox
- New York Yankees
- Tampa Bay Rays
- Toronto Blue Jays
- AL Central
- Chicago White Sox
- Cleveland Indians
- Detroit Tigers
- Kansas City Royals
- Minnesota Twins
- AL West
- Houston Astros
- Los Angeles Angels
- Oakland Athletics
- Seattle Mariners
- Texas Rangers
- Fantasy: Sign up!
- Spring blog