The Orioles' roughed-up pitching staff suffered another blow this morning when All-Star relief pitcher Tippy Martinez underwent an emergency appendectomy at Sinai Hospital.

Martinez was placed on the 21-day disabled list, just six days after Jim Palmer, suffering tendinitis in the triceps muscle of his right shoulder, was added to the list for the second time this season.

The Orioles now have five players on the disabled list, including pitcher Mike Flanagan, catcher Joe Nolan and outfielder Dan Ford.

"Naturally, we're concerned," said Orioles General Manager Hank Peters. "Certain people are hard to replace, and Tippy is one of them.

"We've been getting great performances from the young people. We have to keep our heads above water until we make our season-end run."

Martinez, 33, was 5-3 with a 3.17 earned-run average and 10 saves.

"He'll be in shape when he gets back from the list," Peters said. "It might take him time to get accustomed to pitching, but he's a professional, so it won't be that hard."

The Orioles called up pitchers Allan Ramirez and Paul Mirabella from Rochester. Mirabella, 29, is a left-hander with three mediocre years of major league experience behind him.

"We brought him up because he's a left-hander and he's been in the big leagues," Peters said. "We'll give him a look."

Ramirez made two starts in June, going 1-0 with a 2.25 ERA before being sent down June 14 when Palmer was reactivated.

Mirabella was signed by Rochester in March as a free agent.