SARASOTA, Fla. — The Baltimore Orioles' rotation is beginning to take shape, starting at the top with right-hander Jeremy Guthrie.

SARASOTA, Fla. — The Baltimore Orioles' rotation is beginning to take shape, starting at the top with right-hander Jeremy Guthrie.

Manager Buck Showalter confirmed Thursday that Guthrie, an Ashland native, will start on opening night in Tampa Bay on April 1.

"I don't think that's some big secret," Showalter said.

It will be the third opening day start in four years for Guthrie, the exception last season when veteran Kevin Millwood received the assignment. Guthrie went 11-14 with an 3.83 ERA last season.

Left-hander Brian Matusz will start the second game in Tampa Bay, and second-year pitcher Jake Arrieta has been penciled in to pitch the home opener against Detroit on April 4.

The competition for third starter remains open. Chris Tillman, Brad Bergesen and Zach Britton are competing for the slot. Bergesen has the edge in experience, but he's got a 5.94 ERA this spring compared to 3.55 for Tillman and 0.64 for Britton, who has yet to pitch in the majors.

Justin Duchscherer, who has been bothered by left hip soreness for much of the spring, will probably start the season on the 15-day disabled list. The Orioles hope he can return on April 21 as the fifth starter in the rotation.

The Orioles will probably need a fifth starter on April 10, too.