Cuba won four more gold medals yesterday and finished the World Amateur Boxing Championships in Reno, Nev., with seven of the 12 available. But the United States team wasn't feeling too much pain, reckoning it had proved a lot on the weekend to a lot of doubters.

"We shocked the world," said Darin Allen of Columbus, Ohio, after he and two teammates won championships Saturday. Loren Ross of the U.S. Army at Fort Hood, Tex., tried to make it four titles for the host country, but Cuba's 1982 world champion Pablo Romero outpointed the 178-pounder, 4-1.

Many observers felt Coach Pat Nappi's U.S. team would win no gold medals during the 11-day tournament. But Allen, 21, won at 165 pounds, Kenneth Gould, 19, at 147, and Kelcie Banks, 21, at 125.

Three gold medals equaled the previous best U.S. showing, in the 1982 worlds. This was the fourth world championship tournament.

After his bout, Allen disclosed that after U.S. boxers had lost four straight 3-2 decisions in the early rounds, "we had a team meeting. We got it together. It was a lot like a movie." . . .

Chong Ki-yong, 125 3/4 pounds, won a unanimous 15-round decision over Richard Savage, 124 3/4, of West Monroe, La., in Seoul and retained his International Boxing Federation featherweight title.

American and Indonesian judges turned in identical 144-142 cards in favor of the Korean fighter; a Korean judge scored the bout 147-138 . . .

In Providence, R.I., Johnny Bumphus (29-1) bumped into Marlon Starling and, bizarrely, won the USBA welterweight title.

The adversaries butted heads shortly before the close of the sixth round of the scheduled 12 and Bumphus was gashed deeply above his left eye. After the bell, Bumphus was ruled physically unable to continue, but was declared the winner because the butt was decreed accidental, the fight had gone six rounds and he was ahead on points . . .

Eugene (Sonny) Speed of Palmer Park will meet Darryl Jacobs of Norfolk in the main event of a three-bout boxing card, 8 p.m. May 27 at the Sheraton in New Carrollton. Speed is 3-0 and Jacobs is 10-5, including a loss to IBF champion Harry Arroyo. RUNNING

Ed Eyestone and Grete Waitz, newcomers to the San Francisco Bay to Breakers race, led a festive crowd of 85,000 in chilly fog to win the giant running party in record times.

Eyestone, the 1985 world cross country champion from Provo, Utah, took 20-plus seconds off the record of two-time defending champion Ibrahim Hussein. Eye-stone covered the hilly, 7.46-mile (12-kilometer) course in 34 minutes 32.5 seconds.

Grete Waitz of Norway, the 1984 Olympic marathon silver medalist behind Joan Benoit Samuelson, easily defeated defending champion Samuelson for first in the women's division.

Waitz clocked 38:40.5 to break Samuelson's 1985 record of 39:54.8. Samuelson, too, bettered her mark with a runner-up 39:09.8, but could not muster a challenge over the final few miles. GOLF

Kathryn Crosby has withdrawn her guarantee of $2 million for the new Crosby celebrity/charity golf tournament, but officials say the event at Bermuda Run, near Winston-Salem, N.C., June 5-8 will still be played.

"Mrs. Crosby and her lawyers advised us that she would be unable to guarantee the $2 million purse," said Norman C. Gaddis, president of the National Championship Foundation. A family matter, he said.

Widow of entertainer Bing Crosby, she was a key organizer of this charity tournament after terminating the family's long involvement with the Crosby "Clambake" Pro-Am on California's Monterey Peninsula when the PGA Tour brought in AT&T as a sponsor . . .

In Madrid, England's Howard Clark shot 67 and won the Spanish Open's first prize of $38,685 and a car with 16-under-par 272. Australia's Ian Baker-Finch placed second, defending champion Seve Ballesteros of Spain third . . .

Wake Forest senior Billy Andrade defeated Kurt Beck, University of North Carolina, 3 and 2, in the 36-hole match play final of the 86th North and South men's tournament at Pinehurst, N.C. HARNESS RACING

Rosecroft Raceway closed out its 89-night spring meet last night posting an average handle of $519,052, up 5.2 percent over 1985. Attendance averaged 4,216.

Leading driver was 21-year-old Jim Morand, beating out track veterans Rheo Filion and Gilles Gendron in the closing weeks. George Jefferson was the leading trainer. BOAT RACING

Team Domino's Pizza USA lost the last leg of the 11th Annual Worrell 1000 catamaran race, but its overall time won the event that ended at Virginia Beach. The Domino's team -- Greg Richardson of Myrtle Beach, S.C., and Ray Seaman of Malibu, Calif. -- completed the 12-day trip from Fort Lauderdale, Fla., in 106 hours 42 minutes 12 seconds, beating Australian and African entries in the race of five craft with two-man crews. Team Virginia Beach quit after falling 24 hours behind. Team Carolina dropped out at St. Augustine, Fla., damaged in bad weather. EQUESTRIAN

Linda Lee Reynolds of Clemmons, N.C., won her second Grand Prix horse jumping event, aboard Agedoorn in the second annual $15,000 Keswick (Va.) Jumper Prix at Cismont Manor Farms before a crowd of 8,000. Agedoorn won in 32.55 seconds. In the $10,000 Pimms-Hunter Series, Kitty Beveridge of Middleburg, Va., rode Port Charles to victory. BASEBALL

Chicago Cubs pitcher Rick Sutcliffe was hospitalized during Saturday's game against the Astros after suffering food poisoning at the Cubs' Houston hotel. He was kept overnight for observation.

Also afflicted were teammates Leon Durham, Ron Cey and Gary Matthews (Cey and Matthews made yesterday's starting lineup). Catcher Jody Davis joined them in ordering sandwiches by room service while watching the Mets-Dodgers telecast.

Davis didn't get sick. The players said he was the only one not to put mayonnaise on his sandwich. BASKETBALL

Chicago Bulls owner Jerry Reinsdorf says a decision will be made early this week about his NBA team's coaching position -- amid speculation Stan Albeck will be replaced by Doug Collins.

Reinsdorf met with Collins, former Philadelphia 76ers guard and current analyst for CBS, in Tucson late last week.