A roundup of the week Sept. 1-7

BOXING—MICHAEL SPINKS retained his IBF heavyweight title by stopping challenger Steffen Tangstad of Norway, the European heavyweight champ, at 58 seconds of the fourth round, in Las Vegas. On the undercard, BOBBY CZYZ took the IBF light heavyweight crown from previously unbeaten Slobodan Kacar of Yugoslavia with a fifth-round KO.

Patrizio Oliva of Italy was successful in his first WBA junior welterweight title defense, stopping Brian Brunette of the U.S. in the third round of their scheduled 15-round bout, in Naples.

CYCLING—At the world championships in Colorado Springs, MORENO ARGENTIN, 25, of Italy, won the 162.5-mile men's pro road race in 6:32:38, one second ahead of Charly Mottet of France (page 30). In the women's division, defending champion JEANNIE LONGO of France outsprinted American Janelle Parks by 13 seconds, finishing the 38-mile event in 1:38:56. The pro road races were the culmination of the 12-day championships, during which five world records (pending Union Cycliste Internationale approval) were broken.

PRO FOOTBALL—The season got under way with more than one eye on the instant replay camera, which had its NFL debut in the third play of the Chicago-Cleveland game. Following a bad snap by Bears center Jay Hilgenberg, Al Gross of the Browns recovered the ball in the Chicago end zone and was credited with a TD after a replay showed he had possession. The Browns lost the war, however, 41-31, to the Super Bowl champs. In another eagerly awaited debut, Buffalo's Multimillion Dollar Man, Jim Kelly, passed for three TDs and 292 yards but came up short, losing to the Jets 28-24 (page 40). The defending AFC champion Patriots, aided by Tony Franklin's four field goals, returned to their winning ways by pummeling the Colts 33-3. In the day's biggest upset, the Chargers routed the Dolphins 50-28, the most points ever scored against Miami in coach Don Shula's 17 years at the helm. Eric Dickerson gave Rams coach John Robinson his 100th career win when the running back rushed for 193 yards and two TDs en route to a 16-10 win over St. Louis. Rookie NFL coach Buddy Ryan will have to wait for his first win; his Eagles were trounced by the Redskins 41-14. Oiler QB Warren Moon was stellar as he threw for two TDs and rushed for another in pounding the Packers 31-3. Though the San Francisco defense started two rookies, the 49ers intercepted Tampa Bay QB Steve DeBerg seven times on their way to a 31-7 victory. Joe Montana, who showed no signs of his preseason ankle injury, passed for 356 yards and one TD. Elsewhere, the Broncos nipped the Raiders 38-36; the Seahawks shut out the Steelers 30-0; Detroit edged Minnesota 13-10; Atlanta had an easy time with the Saints, beating them 31-10; and the Chiefs defeated the Bengals 24-14.

GOLF—RICK FEHR shot a 17-under-par 267 for a two-stroke victory, worth $72,000, over Larry Mize, at a PGA tournament in Endicott. N.Y.

At an LPGA event in Portland, Ore., AYAKO OKAMOTO of Japan beat Nancy Lopez and Colleen Walker by six strokes. Her nine-under-par 207 earned her $30,000.

HARNESS RACING—JATE LOBELL ($2.60) with trainer Mark O'Mara in the sulky, was a 2½-length winner over Simcoe Hanover in the Kentucky Pacing Derby at Louisville Downs. The colt tied the half-mile-track world record for 2-year-olds by pacing the mile in 1:55[2/5] and took home $204,785.

HORSE RACING—OGYGIAN ($3), with Walter Guerra up, caught the pace-setting Groovy at the furlong pole, then held off Mogambo in the stretch to win the 117th running of the Jerome Handicap at Belmont Park by a head. Coming off a 58-day layoff and carrying topweight of 126 pounds, the 3-year-old colt ran the mile in 1:34 flat and took home the winner's share of $127,620.

Undefeated BET TWICE ($7.60), with Craig Perret in the irons, posted his fourth victory by finishing five lengths in front of Conquistarose in the Arlington-Washington Futurity, at Arlington Park. The 2-year-old clocked the mile in 1:37[1/5] and earned $282,420. On the same card, SOUTHJET ($13.20) capped the Secretariat Stakes for 3-year-olds by out-gaming Glow in the stretch to win by three-quarters of a length. The colt, ridden by Jose Santos, covered the 1¼ miles on the grass in 2:02[2/5] and took home $102,510.

Lady's Secret ($2.60), ridden by Pat Day, led wire to wire in a seven-length triumph over Steal a Kiss in the Maskette Stakes, the first leg of Belmont Park's fall championship series for fillies and mares. Secretariat's 4-year-old daughter, who swept the series last year, ran the mile in 1:33⅖ the third-fastest in Belmont history, and won $81,060 to boost her earnings to $2.1 million.

MOTOR SPORTS—BOBBY RAHAL, in a March-Cosworth, finished 13.74 seconds ahead of Al Unser Jr. to win $76,110 at a CART event, in St. Pie, Quebec. He covered 225 laps of the .826-mile tri-oval at an average speed of 103.157 mph to post his second straight victory.

Tim Richmond drove his Chevrolet to victory in a NASCAR race, in Richmond, Va., to collect $35,005. He averaged 70.161 mph and beat Dale Earnhardt by two car lengths.

Nelson Piquet, 34, of Brazil, driving a Williams-Honda and averaging 141.591 mph, beat Nigel Mansell of Britain by 9.82 seconds to win the Italian Grand Prix, in Monza.

TENNIS—Four native Czechs reached the U.S. Open finals. IVAN LENDL defeated Miloslav Mecir 6-4, 6-2, 6-0, and MARTINA NAVRATILOVA beat Helena Sukova 6-3, 6-2, at Flushing Meadow, N.Y. (page 32).

TRACK & FIELD—MARK NENOW, 28, of Lexington, Ky., established an American record in the men's 10,000 meters with a clocking of 27:20.56, at an international meet in Brussels. Belgium. Nenow bettered the previous mark of 27:25.61 set in 1982 by Alberto Salazar.

Yordanka Donkova of Bulgaria broke her world record in the women's 100-meter high hurdles with a 12.26 clocking, in Ljubljana. Yugoslavia. Her previous mark of 12.29 was set in Cologne, West Germany, last month.

MILEPOSTS—CLEARED: By a grand jury in Pickens, S.C., that ruled there was insufficient evidence to indict them, two present and two former Clemson football players, of sexual assault, kidnapping and larceny charges. Tailback KENNY FLOWERS, defensive back A.J. JOHNSON and former players DUKE HOLLOMAN and CRAIG CRAWFORD had been accused of assaulting the mother of another player on June 20.

SUSPENDED: By the NCAA, 53 members of the University of Nebraska football team for one game and seven players for two games for misuse of complimentary tickets. The NCAA granted the university's request for a five-day postponement of the suspensions, pending an appeal this week, thus allowing the Cornhuskers to field a full team against Florida State (page 65).

By the NHL, for the first eight regular-season games, Toronto Maple Leafs defenseman BORJE SALMING, 35, for admitting he used cocaine "five, six years ago." The NHL began investigating the 13-year veteran after a Toronto newspaper published his remarks last May.

TRADED: By the Seattle Seahawks, veteran safety JOHN HARRIS, 30, to the Minnesota Vikings for a future draft choice; by the New Orleans Saints, running back WAYNE WILSON, 29, to the Vikings for wide receiver MIKE JONES, 26.

By the Dallas Mavericks, forward JAY VINCENT, 27, to the Washington Bullets for a 1990 first-round draft pick. In five NBA seasons, Vincent averaged 16.9 points per game and 6.5 rebounds for the Mavericks.

DIED: HANK GREENBERG, 75, a first baseman and outfielder who spent 12 years with the Detroit Tigers (1930; '33-41; '45-46) and was the American League's MVP in 1935 and 1940; of cancer; in Beverly Hills, Calif. Greenberg, who was the first Jewish player to be inducted into the Hall of Fame, led the American League in home runs and RBIs four times, his best season coming in 1938 when he hit 58 homers and drove in 146 runs. He finished his career with the Pittsburgh Pirates (1947) and was an owner and executive with the Cleveland Indians (1948-57) and vice-president of the Chicago While Sox (1959-63) (page 24).