The Orioles: no holdouts, no hassles, but always something. Mike Flanagan, five-year, $2.75 million contract scarcely 72 hours in hand, became the first casualty of Baltimore spring training yesterday. Strained ligaments around his left knee. Not serious, "he should be fine in a day or two," says Dr. Leonard Wallenstein, the team physician, in Miami. Still . . .

Leg problems are nothing to be taken lightly by a pitcher who encountered arm troubles each of the two seasons since his '79 AL Cy Young award. Leg injuries often bring on arm miseries. "It just stiffened up on me" after running, Flanagan said. "I stayed out of the drills only as a precautionary measure." . . .

Bear Bryant, 68, no cinch yet to coach Alabama football beyond age 70. A Montgomery judge, giving lawyers two weeks to prepare briefs pro and con the state Teachers Retirement System's challenge to the keep-Bear-coaching bill passed by the 1981 legislature, remarks that he sees a real constitutional problem in such a measure "intended to single out one person" . . .

Coach-go-round: Bill Moultrie of Howard named head coach of the East team in track and field for the U.S. Olympic Committee's 1982 National Sports Festival. He was assistant last year, also served as sprint chairman for the region and national cochairman in developing 200-meter talent . . . Soccer's Cosmos serve up a surprise, Prof. Julio Mazzei returning as coach for NASL outdoor season. While the club "scours the world for an international coach," Mazzei is "interim" replacement for his 1980 successor, last week's splittee Hennes Weisweiler, and jokes: "It looks like the professor will be the Bob Lemon of the Cosmos organization." Immediate benefit: Carlos Alberto, Meadowlands star banished by Weisweiler, re-signed . . . College hockey's biggest winner, John MacInnes (552-293-38, three NCAA titles), knocks off after this season, his 26th, for less strenuous pursuits there at Michigan Tech . . . Maryland's Lefty Driesell at weekly basketball press conference: "The only two teams that have blown us out all season were UCLA and N.C. State, and we'll settle that (74-53) State thing on Wednesday . . . We're gonna jump after them." At turtle step?

George Washington had a shot at its first home game ever in an Eastern Eight tournament by coupling a Duquesne win over St. Bonaventure last night with Smith Center victory Wednesday over Rutgers. Sorry. Bonnies didn't cooperate . . . Rutgers will go at GW with E-8 rookie of week in Bowie's Brian Ellerbe. Big East rookie of third straight week, fourth this season, is Georgetown's Pat Ewing. ECAC Division II player of week, solo after "co-ing" last week: UDC's Earl Jones. ECAC South Div I player of week, "co": Navy's Gary Price . . . Last hurrah time, this last week of regular season, for Navy senior Colleen Cassidy, at 5 feet 4, from Gaithersburg, holder of all the academy women's basketball records (1,762 points going into finale Thursday, home vs. Morgan State) . . .

A. A domed stadium might grow in Brooklyn, if the $30,000 feasibility study approved by the state legislature leads onward. Sponsoring State Sen. Thomas Bartosiewicz says he realizes the Dodgers are gone forever, but "We would welcome the San Francisco Giants" . . . Q. Latest sports star with a restaurant named for him?