USFL running back Marcus Dupree, Arizona State's two-time all-America linebacker David Fulcher and six other players have been declared eligible by NFL Commissioner Pete Rozelle for the league's April 29 draft.

But Dupree's agent said the former Oklahoma star may not be healthy enough to play because of a knee injury suffered 14 months ago when he was with the now-defunct Portland Breakers.

Of the other players granted eligibility, three are from Kansas -- running back Robert Mimbs, wide receiver Johnny Holloway and defensive back Alvin Walton. The others are center Andy Baroncelli of Southern California, defensive back Reggie Sutton of Miami (Fla.) and linebacker Gerald Taylor of Texas Christian.

Dupree's physician, Dr. Doug Rouse of Hattiesburg, Miss., said Dupree had been recovering well until about six weeks ago. "He was working out and apparently jumped and came down wrong," Rouse said. "Since that time, the knee has been swelling and he has had pain. At this point, we can't get either out of his knee and we've been working religiously." . . .

Washington Redskins defensive end Dexter Manley was taken by ambulance to Georgetown University Hospital yesterday afternoon, where he was examined in the emergency room and released, a hospital spokesperson said.

Hospital officials would not disclose the nature of Manley's problem. GOLF

Patty Sheehan shot a 68 to give her a three-stroke lead after three rounds of the $200,000 Kyocera Inamori Classic at Bernardo Heights Country Club in San Diego.

Second-round leader Pat Bradley had five birdies but two double-bogeys in a two-over-par 74, leaving her in a second-place tie with Ayako Okamoto, who shot a 69. Jan Stephenson, Deb Richard and Atsuko Hikage are four shots back at 212. HOCKEY

Buffalo Sabres goaltenders Jacques Cloutier and Tom Barrasso had different fortunes during the opening round at the world championships in Moscow.

Cloutier helped Team Canada to an 8-3 victory over West Germany. However, Barrasso was unable to protect a two-goal lead and Finland defeated Team USA, 5-4.

Poland and the Soviet Union also posted opening-round triumphs. Poland upset defending world champion Czechoslovakia, 2-1, and the powerful Soviet team beat Sweden, 4-2. AUTOS

Darrell Waltrip took the lead on lap 107 and went on to win by 6.41 seconds in the Dixie Cup 200 Grand National race at Darlington (S.C.) International Raceway. Waltrip, who took the lead from Dale Earnhardt, averaged 123.423 mph in his Chevrolet and picked up $11,570 for the 200-mile, 147-lap event. BASEBALL

Former Cincinnati Reds star Ted Kluszewski was listed in stable condition at St. Joseph's Hospital in Tampa, Fla., recovering from a heart attack.

Kluszewski, 61, was admitted to the coronary unit Friday, said Janet Gorman, intensive care unit supervisor.

He played for the Reds from 1947 to 1957 and is the team's minor league batting instructor. BOXING

Mark Breland knocked down Daryl Anthony with a right to the jaw and stopped him in the third round in Totowa, N.J., to avenge the only defeat he has suffered in 111 amateur and 11 pro bouts.

Breland (11-0, six KO), who weighed 147 1/4, cut Anthony (22-3-2, 15 KO) over the left eye in the first round and then knocked him down with about a minute left in the third.

Anthony, 143 3/4, of St. Louis, had scored a 3-2 decision over Breland in a three-round bout in the 1981 U.S. Amateur Championships. COLLEGES

Former Maryland assistant Tom Abatemarco, for the last four seasons an assistant coach at North Carolina State, was named to replace Pat Foster as Lamar University's head basketball coach. Abatemarco, 36, succeeds Foster, who left last week to take the head coaching job at Houston.