A roundup of the week Sept. 10-16

BOXING—WBC super welterweight THOMAS HEARNS retained his title with a third-round TKO of Fred Hutchings in Saginaw, Mich.

Julio Cesar Chavez of Mexico scored an eighth-round TKO over countryman Mario Martinez to win the WBC super featherweight title, which had been vacant, in Los Angeles.

PRO FOOTBALL—NFL: The L.A. Raiders are a bottom-line football team. Forget Jim Plunkett's four interceptions, 132 yards in team penalties and a 20-19 fourth-quarter deficit to Kansas City, which was bidding for its first 3-0 start in 18 years. The bottom line was a 42-yard pass from Plunkett to Malcolm Barnwell with 1:54 left, which took the ball to the Chiefs' six-yard line. That set up Chris Bahr's 19-yard field goal with a minute remaining, and the Raiders were 22-20 victors, 3-0, and No. 1 in the AFC West. In Foxboro, Seattle moved out to a 23-0 lead over New England. Then second-year Patriot quarterback Tony Eason took over for Steve Grogan. He threw two touchdown passes and ran for another, sparking a 38-23 win. The good news in Chicago—other than the Cubs—is the Bears, who after edging Green Bay 9-7 on three Bob Thomas field goals (page 20), are 3-0 for the first time since 1978 and atop the NFC Central. Against Cincinnati, Freeman McNeil (two TDs, 150 yards on 26 carries) and Pat Leahy (five field goals) put up some big numbers for the New York Jets, but quarterback Pat Ryan had the biggest reason to celebrate. He completed 20 of 33 for 251 yards on his 29th birthday. In Minnesota, first-year Viking coach Les Steckel, the former Marine, was looking for a few good men after losses to San Diego and Philadelphia. He found them against Atlanta, as running back Alfred Anderson threw his second TD pass in two weeks and Jan Stenerud booted a team-record 54-yard field goal to help the Vikes win 27-20. Resurgent St. Louis rallied to defeat Indianapolis 34-33, while Washington, struggling to find its form of last year, used defense to defeat the high-flying New York Giants. Fourth-quarter turnover touchdowns by cornerback Vernon Dean and safety Curtis Jordan turned a tight game into a 30-14 Redskin rout. In other action, Pittsburgh held its AFC Central lead with a 24-14 win over Los Angeles, Tampa Bay nipped Detroit 21-17, San Diego crushed Houston 31-14, San Francisco went to 3-0, maintaining its NFC West lead by holding off New Orleans 30-20; Dallas defeated Philadelphia 23-17 and Denver clubbed Cleveland 24-14.

GOLF—MARK O'MEARA won his first PGA Tour event, with a 72-hole score of 272, 16 under par, defeating Tom Watson by five strokes in the Greater Milwaukee Open.

Kathy Whitworth finished at 9-under-par 279 to win a $175,000 LPGA tournament in Kent, Wash, by two strokes over Laura Baugh Cole and Marta Figueras Dotti.

HOCKEY—Team Canada, with Quebec's Michel Gou-let scoring a pair of goals, defeated Sweden 5-2 in the opening game of a best-of-three Canada Cup championship series, in Calgary. Team Canada had earned a spot in the finals of the six-nation round-robin event three days earlier by stunning the Soviet Union 3-2 in overtime. A long slap shot by Edmonton defenseman Paul Coffey deflected off the shoulder of New York Islander forward Mike Bossy at the 12:29 mark, avenging an earlier 6-3 loss to the Soviets and giving Team Canada the satisfaction of eliminating the U.S.S.R. from an international tournament for the first time since 1972. Sweden advanced to the finals by beating the U.S. 9-2.

HORSE RACING—SLEW o' GOLD ($3.40), ridden by Angel Cordero Jr., overtook Shifty Sheik to win the $292,000 Woodward Stakes at Belmont Park by half a length. The 4-year-old son of Seattle Slew ran 1‚⅛ miles on a sloppy track in 1:47[4/5].

ROAD RACING—JOAN BENOIT ran the half marathon in 1:08:34 in Philadelphia, breaking by 36 seconds the women's world-best mark she set in the same race last year.

SAILING—WEST GERMANY defeated teams from the U.S., Italy and 13 other nations to win the Sardinia Cup regatta off Porto Cervo, Sardinia.

SOCCER—The NASL playoffs begin this week, but for the first time since 1975, five-time league champion New York will be on the outside looking in. With three games left as of Sept. 8, the Cosmos appeared a shoo-in, needing just three points to make it into postseason play. But they were shut out by Tulsa, Golden Bay and Chicago, allowing Toronto, which was idle this week, to slip into second place behind Chicago and claim a wild-card berth. Chicago will open its best-of-three semifinal action against Vancouver, which became the second wild-card qualifier when San Diego beat Minnesota 4-0 in Minneapolis Friday night. The Sockers were in third place in the Western Division prior to their game with Minnesota, and the victory allowed them to overtake both Minnesota and Vancouver for the division championship. San Diego plays Toronto in the other semifinal series.

WEIGHTLIFTING—Seven world records were set in an international competition in Varna, Bulgaria. In the 123-pound division Bulgaria's NAIM SULEIMANOV lifted 375 pounds in the clean-and-jerk event, one pound over the world mark he set last May. In the 165-pound division Bulgaria's ZDRAVKO VELICHKOV established a combined world record of 831 pounds and raised the world clean-and-jerk standard to 464 pounds. VIKTOR SOLODOV of the Soviet Union set two records in the 198-pound division. He had a combined lift of 230 pounds and jerked 513 pounds, bettering his own world record of 512 pounds set last April. His countryman, YURI ZAKHAREVICH, an under-243-pounder, also set two records: 446 pounds in the snatch, 974 pounds in the combined.

MILEPOSTS—FIRED: CHARLEY PELL, 43, head football coach at the University of Florida who had announced his resignation effective at the end of the '84 season. Pell had come under fire during an NCAA investigation of his program, which detailed 107 alleged violations. Pell, whose five-and-a-half-year record at Gainesville was 33-26-3, was replaced by offensive coordinator GALEN HALL, 44.

SOLD: By the financially troubled Golden Bay Earthquakes, who may merge with San Diego, forward STEVE ZUNGUL, 30, the MISL's alltime leading scorer with 419 goals, midfielder BRANKO SEGOTA, 23, and defender FERNANDO CLAVIJO, 27, to the San Diego Sockers.