One of the highlights of the Senators' last baseball season came when Pete Broberg, fresh out of the amateur draft and Dartmouth, started against the mighty Boston Red Sox (and shut them out until the seventh inning, when Casey Cox blew the kid's 3-0 lead in relief). The world turns, and Charlie Finley has ordered Manager Jack McKeon to scratch his scheduled pitcher Sunday for the Oakland A's against the Baltimore Orioles - in favor of Mike Morgan, fresh out of the amateur draft and Valley High School, Las Vegas. The scheduled starter was Pete Broberg.

Finley, who knows when to spend and when not to, says he already had Morgan, 16, signed for a bonus of "more than $50,000" before the A's announced him as their fist pick (fourth player overall) in this week's draft. And, recalling how he made an instant major leaguer out of high school pitcher Lew Krausse and was rewarded with a three-hit shutout in Krausse's debut for his (Kansas City) A's over the Angels, July 16, 1961, Charlie O told young Morgan to step right into the rotation; if he isn't ready, the world will fing out soon enough.

And there was one other schoolboy he made an instant major-league A: Catfish Hunter . . .

Slick Watts, who left his heart in Seattle when the SuperSonics shed him early this past, at last, NBA season, has left a virtually demolished family car in Pendleton, Ore. - and it could have been worse. His wife fell asleep at the wheel, he told officers after the auto flipped. Mrs. Watts and youngsters Reginald 7, and Donald Jr., 1, escaped injury; the Slick one, now a New Orleans Jazz playmaker, sustained minor cuts and bruises, rubbed a slight bump on his famous bald head and commented, "Had I been wearing my headband I probably would have gone unscathed." The family had been headed for Mississippi on vacation, but after the accident Watts decided to fly to Seattle to take in last night's basketball game . . .

A second Redskin staffer (following Assistant Coach Marv Matuszak) has sued the club for breach of contract stemming from the coaching changeover and personnel cutback. Edward T. Buckley went to federal district court, Alexandria, complaining that he had a $92,000 contract, over four years beginning last Aug. 1, as a full-time scout but the team summarily cut off his paychecks in March. Buckley declares that he signed the pact with the coach-general manager at the time, George Allen; filed with the court papers is a letter from Allen to Buckley confirming agreement and adding that Allen would have a contract made up "but for now this is official." The Redskins' attorney, Lawrence Lucchino countered that in fact a contract never had been drawn up and signed."The one thing we learned from the whole George Allen episode," Lucchino said, "is that you have no contract until you have a contract". . .

Adventures of George Allen in L.A., continued: At one of his minicamps lately, he began by hauling around a large, full trash bag, tied at the top. Whe nobody asked, he shouted at the assembled Rams anyway: "You know what's in this trash bag? I'll tell you . . . Roger Staubach is in the bag and we're going to keep him there all year" . . .

Staubach's fellow former Navy quarterback, Coach George Welsh of the Mids, and Maryland's Jerry Claiborne will join in a Touchdown Club salute to high school and prep football coaches of the capital area and from all over the East Coast (some 120 expected by Slug Witucki, chairman) tomorrow night, 7-11.30 p.m. Public invited: refreshments; $5 . .At year-end ceremonies in Annapolis, the Naval Academy Athletic Association Sword to the graduating mid who has "personally excelled" in varsity sports went to basketball center Hank Kuzma, and his team captaincy was bestowed on the St. John's High Cadet turned midshipman, Kevin Sinnett. . .

Howard U. has signed its sixth and final 1978 basketball recruit to a four-year scholarship: guard Mo Young, 6-3, All-Metro Conference at Mackin . . . Leroy Moreno, erstwhile Spingarn athlete who a particular pride of the Executive III program to make scholar-athletes out of those who might not otherwise have had the opportunity, sparkled again the past winter for Southeast Community College, Fairbury, Neb., and has landed a basketball grant to Montana State. . .

Going the other way: Kansas State's star soph forward from Brooklyn, Curtis Redding, reported leaving school . . . And another (short-term) Navy quarterback, Steve Rogers, who transferred to Georgia Tech and made alternate starter there, has been kicked off the team for 1978; undisclosed disciplinary reasons . . .

And look who the NCAA has slapped, ever so gently; mighty Ohio State. In the 1973-75 span the Buckeyes treated too many prospects or their parents to too many meals, or auto rides, says the Infractions Committee, but since the sins were "self-disclosed" and not that goshawful, no sanctions, A Pyrrhic victory for Michigan Staters who sicked the investigators on Columbus?