Cleveland, via Mayor George Voinovich, has offered itself to President Carter as the site for an altenative 1980 Olympiad, but as far as heavyweight champion Larry Holmes is concerned, the burg can sink into Lake Erie.

And Muhammad Ali can sink into Deer Lake.

Holmes became father of a 7-pound 11-ounce girl, Claudie Laurie Holmes, yesterday in his hometown of Easton, Pa., and, pausing between handshakes and autographing, said it will be a "sad day for boxing" if Ali, now in training at Deer Lake, Pa., returns to the ring.

Sad, Holmes said, because the three-time champ is "going to get hurt. He's a nut. He makes certain statements that he knows he can't keep. His mind tells him one thing but his body tells him another."

Little wonder Ali figures to fight less-experienced WBA titleholder John Tate ahead of Holmes, said Holmes.

Oh yes, Holmes' gripe against Cleveland: He'd begun training in Rocky Marciano's gym there for his March 31 defense against Leroy Jones when in walked two phonies with badges serving him a fake subpoena last week over a fictitious paternity suit. Some joke with wife Diane expecting in Easton, so Holmes packed and went home, vowing never to return . . .

"When you mature, you tend to change," says St. Louis Card shortstop Garry Templeton of his metamorphosis over a year's time. "I'm going to try to do things that are right -- stay away from the wrongs. I want to quit being a meany; I want to be a goody." So, he declared in St. Petersburg, he will put back more than $12,000 from his new $4 million, six-year contract into box-seat tickets for under-privileged and handicapped children -- 50 for each Cardinal home game in June, July and August . . .

Yet three more gold-medal NHL initiates: Olympian Bill Baker signed by Montreal, Mike Ramsey and Rob McClanahan playing for Buffalo . . . The U.S. Olympic basket ball coach, Dave Gavitt, continues preparations to put together a team, Moscow or no; letters have been mailed to 400 prospective candidates for 64-player tryouts in Raleigh May 18-23. They'll play somebody, somewhere, Gavitt figures . . . Another drug bust: Jack Babashoff Jr., silver-medal swimmer at Olympics '76, held on $10,000 bond in Tuscaloosa, Ala. Allegedly tried to sell cocaine to undercover narcotics agents . . .

Kim McQuilken will be back to push Joe Theismann to perhaps greater heights and as injury insurance. The Redskin reserve quarter-back played out his option but has signed a two-year contract without option clause, allowing him to become a free agent again in '82 . . . Body-shuffling in the Dips' NASL division: Francisco Marinho and his six-figure salary sold by the Cosmos to Fort Lauderdale . . .

In Baltimore this week, sports and business biggies launched plans for a Wes Unseld testimonial dinner at Martin's West up there on June 17 -- to benefit Project Survival, oriented to youth, thus close to the heart of the civic-minded Bullet captain . . . Another big man in the Capital Centre family, Hymie Perlo, has his day in the sun March 21. Perlo, erstwhile matchless Washington athlete turned nonpareil community relations specialist, will be saluted by some of his countless friends Friday, March 21, at the K. of C. Hall Forestville. Call Reds Vernon or Jack Hoffman . . .

Birth announcement from Orange, Calif.: It's a 7-pound 10-ounce son Ryan, to ex-NFL star Tommy Mason and ex-gymnastic star Cathy Rigby Mason. Passing the word to Washington buddy Jan Rus, San Bernardino beer distributor Mason said it was too bad he'd already used the line when Bucky, now 4 1/2, was born -- "he'll probably be either a 6-foot gymnast or a 4-foot halfback". . .

Maryland varsity baseball starts today, year 20 for Coach Jack Jackson, with Terps at Richmond.