A roundup of the week Sept. 5-11

BOXING—AARON PRYOR retained his WBA junior welterweight title with a 10th-round knockout of Alexis Arguello in Las Vegas (page 32).

Larry Holmes successfully defended his WBC heavyweight title for the 16th time when his bout in Atlantic City with Scott Frank was stopped with 1:32 left in the fifth round.

Jeff Chandler knocked Eijiro Murata down five times to win his fight in the 10th round and retain his WBA bantamweight title, in Tokyo.

PRO FOOTBALL—Denver rookie John Elway was bailed out for the second week by veteran Quarterback Steve DeBerg, who scored on a two-yard run with 29 seconds remaining to beat Baltimore 17-10. Elway now has completed only 10 of 29 pro passes, and he left his first game with an elbow injury and this one, in the fourth quarter, with a sore shoulder. Without Elway, Denver is nonetheless undefeated, as is Miami, which beat New England 34-24, and the Raiders, who defeated Houston 20-6. Both losers are 0-2. Rushing was the key in Seattle (1-1) and Pittsburgh (1-1) wins. The Seahawks upended the Jets, 17-10, for the seventh time in seven meetings, largely because of rookie Curt Warner's 128 yards rushing, and the Steelers' Franco Harris broke the 100-yard mark for the 43rd time with 118 in a 25-21 defeat of Green Bay. He also became the third NFL runner to gain 11,000 or more career yards. The Packers and Jets both fell to 1-1 on the season. Chicago (1-1) overpowered winless Tampa Bay 17-10 when Terry Schmidt intercepted a Jerry Golsteyn pass and returned it 32 yards for a TD. The felines didn't fare well; the Bengals dropped to 0-2 with a 10-6 loss to Buffalo, and the Lions couldn't handle Brian Sipe, who fired four touchdown passes in a 31-26 Cleveland victory. And with the exception of the Seahawks, neither did the fowl. The Giants' Ali Haji-Sheikh beat the Falcons 16-13 in overtime with a 30-yard field goal, while Dallas remained unbeaten by trouncing the Cardinals 34-17. The Cowboys trailed early in that game, by a 10-0 count, as they also did, 23-3, in their Monday night 31-30 win over Washington. With Danny White throwing for three touchdowns, Dallas scored 28 straight second-half points. Washington avenged that loss with a 23-13 victory over Philadelphia (page 42), and San Francisco, too, showed its Super Bowl form of the recent past in a 48-17 Thursday night massacre of Minnesota.

GOLF—MARK LYE came from eight strokes back in the final round to win his first tournament, after seven years on the tour, a $350,000 PGA event in Sutton, Mass. He shot an 11-under-par 273 to beat John Mahaffey, Jim Thorpe and Sammy Rachels by a stroke.

Joanne Carner beat Charlotte Montgomery on the first playoff hole to win a $150,000 LPGA event in Portland, Ore. Both finished regulation play with a four-under-par score of 212.

Rookie LAURI PETERSON won her first LPGA tournament, the $150,000 Rail Charity Golf Classic in Springfield, Ill., beating Judy Ellis on the first hole of sudden death. Both finished regulation play at six-under-par 210.

HORSE RACING—WORLD APPEAL ($24.80), Antonio Graell up, beat Hyperborean by 2¼ lengths to win the $225,600 Pegasus Handicap at the Meadowlands. The 3-year-old colt ran the 1‚⅛ miles in 1:46[3/5].

On a high ($29.80), ridden by Steve Harris, beat Mr. Suspenders by a nose to win the $2.53 million All-American Futurity at Ruidoso Downs. The 2-year-old colt ran the 440 yards in 22.03 seconds.

MOTOR SPORTS—NELSON PIQUET, in a Brabham, beat Rene Arnoux, in a Ferrari, by 10.2 seconds to win the Grand Prix of Italy. Piquet averaged 134.8 mph around the 52 laps of the 3.6-mile Monza Autodrome circuit.

Bobby Allison drove his Buick to victory in a 400-lap Grand National event in Richmond, averaging 79.381 mph around the .542-mile Fairgrounds oval, and beating Ricky Rudd, in a Chevrolet, by two seconds. Six days earlier Allison had beaten Bill Elliot, in a Thunderbird, by 9.3 seconds to win the Southern 500. He averaged 123.343 for 367 laps around the 1.366-mile Darlington (S.C.) International Raceway oval.

SAILING—AUSTRALIA II, skippered by John Bertrand, beat Britain's Victory '83 for the right to challenge Liberty for the America's Cup.

SOCCER—NASL: Montreal upset the defending champion Cosmos 4-2 in the opening game of their quarterfinal playoff series. The Manic, which lost all four regular-season games against the Cosmos and had the worst record of the eight playoff teams, shut down league-scoring-leader Roberto Caba√±as, who failed to score for the first time in four games. Montreal's Brian Quinn had two goals, boosting his year's total to seven. In the other three playoffs, Western Division-champion Vancouver beat Toronto 1-0 on Forward Alan Taylor's goal; Golden Bay demoralized Chicago 6-1 but not before the entire Sting team stormed the field in pursuit of Referee Howard Krollfeifer after a controversial call in the second half; and Tulsa, champion of the Southern Division, eliminated Fort Lauderdale 3-2 in double overtime and 4-2, scoring all four goals in the final nine minutes.

TENNIS—JIMMY CONNORS defeated Ivan Lendl in the finals for the second straight year, 6-3, 6-7, 7-5, 6-0, to win the men's singles title at the U.S. Open at Flushing Meadow, N.Y., while MARTINA NAVRATILOVA beat Chris Evert Lloyd 6-1, 6-3 for the women's crown. JOHN McENROE and PETER FLEMING dispatched Fritz Buehning and Van Winitsky 6-3, 6-4, 6-2 in the finals of the men's doubles; NAVRATILOVA and PAM SHRIVER won the women's doubles championship with a 6-7, 6-1,6-3 win over Candy Reynolds and Rosalyn Fairbank; and in the mixed doubles final, ELIZABETH SAYERS and JOHN FITZGERALD upset top-seeded Barbara Potter and Ferdi Taygan 3-6, 6-3, 6-4 (page 24).

MILEPOSTS—TRADED: By the Calgary Flames, Center GUY CHOUINARD, 26, to the St. Louis Blues for future considerations; by the Philadelphia Flyers, Right Wing TOM GORENCE, 26, to the Hartford Whalers for future considerations; and by the Pittsburgh Penguins, Left Wing ANDERS HAKANSSON, 27, to the Los Angeles Kings for Center KEVIN STEVENS, 18.

By the Pittsburgh Pirates, Pitcher RANDY NIEMANN, 27, to the Chicago White Sox for Outfielder MIGUEL DILONE, 28, and Pitcher MIKE MAITLAND, 23.

By the Portland Trail Blazers, Forward LINTON TOWNES, 23, to the Cleveland Cavaliers for a second-round pick in the 1987 draft.

DIED: CLAUDE (BUDDY) YOUNG, 57, All-America (1944) halfback for the University of Illinois, who performed for four teams during a nine-year pro career, his last three seasons at Baltimore; of injuries sustained in a one-car accident; in Terrell, Texas. He was awarded Player of the Game in the 1947 Rose Bowl after scoring two touchdowns for the Illini in their 45-14 win over UCLA. In 1964 he became NFL director of player relations and the first black executive hired by a major sports league. He was elected to the Pro Football Hall of Fame in 1968.

Ike Armstrong, 88, University of Utah football coach for 25 years in the 1920s through '40s, who was elected to the college football Hall of Fame; of pneumonia; in Corona del Mar, Calif. Armstrong, who was known as the "Rockne of the Rockies," had a 140-57-13 career record with five undefeated seasons.