The Baltimore Orioles announced yesterday that right-hander Dennis Martinez (16-12 in 1982) will face Kansas City's Larry Gura (18-12) in the American League opener Monday at Memorial Stadium.

Other probable starters in the series will be Mike Flanagan (15-11) for the Orioles Wednesday against Dennis Leonard (10-6) for the Royals. The Orioles' starter on Thursday will be Scott McGregor (14-12) and Vida Blue (13-12) will be pitching for Kansas City.

Orioles spokesman John Blake said right-hander Jim Palmer is still bothered with stiffness in his back, a problem that plagued him throughout spring training. Blake said Palmer will probably make his first start Saturday in Cleveland.

The Orioles raised their spring record to 15-10-1 with yesterday's 3-2 victory over the Texas Rangers in Miami, after rookie John Shelby hit an inside-the-park home run with one out in the tenth.

Shelby's home run, off Odell Jones, was his third hit of the day and raised his preseason batting average to .444, the highest spring average in the last 29 years for the Orioles.

Boxing: The Ohio Supreme Court ruled that the World Boxing Association junior welterweight championship fight would go on as scheduled tonight in Atlantic City, with Aaron Pryor defending his title against Sang Hyun-Kim of Korea, but that all proceeds designated for Pryor will be held in escrow.

That money will be distributed pending a final determination of the court fight between Pryor and his manager, Donald (Buddy) LaRosa.

Pryor's lawyer had filed an appeal Thursday asking reversal of a decision halting the bout, issued earlier this week by the 1st Ohio District Court of Appeals. The lower court said the fight would need the permission of LaRosa.