A Roundup of the Week Oct. 12-18

BASEBALL—The Minnesota Twins swept two games in the Metrodome, 10-1 and 8-4, against the St. Louis Cardinals to take a 2-0 lead in the World Series (page 46).

BOXING—MIKE TYSON retained his undisputed heavyweight title with a seventh-round technical knockout of Tyrell Biggs in Atlantic City (page 64).

Khaosai Galaxy of Thailand knocked out Chung Byong Kwan of South Korea at 2:58 of the third round to retain his WBA junior bantamweight title, in Bangkok.

Jeff Fenech of Australia defended his WBC super bantamweight title, defeating Carlos Zarate of Mexico, in Sydney. Referee Hank Elespuru stopped the fight in the fourth round after Zarate opened a deep cut under Fenech's right eye with a head butt. Elespuru ruled the butt accidental and ordered the judges' cards tallied. Fenech led 40-34 on all three cards.

PRO FOOTBALL—The last week of replacement football was marked by many returning veterans replacing the replacements and dominating the competition. Quarterback Jeff Kemp and receiver Steve Largent of the Seattle Seahawks played pitch and catch at will in a 37-14 win over the Detroit Lions. Largent left the game in the third quarter with 15 receptions for 261 yards and three touchdowns. Pat Ryan of the Jets, normally an understudy to Ken O'Brien, completed 30 of 49 passes for 301 yards in a 37-31 overtime victory over the Dolphins. Gary Danielson, a perennial backup, threw for 281 yards and four TDs as the Browns trounced Cincinnati 34-0. Doug Flutie, the former BC quarterback, late of the Chicago Bears, returned to New England and led the Patriots to a 21-7 victory over the Oilers. Veteran receiver John Stallworth caught his 500th career pass, a three-yard TD, as Pittsburgh beat the Colts 21-7. Joe Montana completed 31 of 39 passes for 334 yards in the 49ers' 34-28 victory over the Cardinals. Buffalo kicker Todd Schlopy booted a 27-yard field goal with :19 remaining in overtime to send the Giants to their fifth consecutive loss, 6-3. QB Erik Kramer sparked Atlanta to a 24-20 win over the Rams, passing for 335 yards and three touchdowns. The Chargers slipped past the Raiders 23-17, with 16 fourth-quarter points. Green Bay whipped Philadelphia 16-10 on a five-yard TD run by James Hargrove at 5:04 of overtime. Tampa Bay defeated the Vikings 20-10, Denver beat Kansas City 26-17, and New Orleans nipped the Bears 19-17.

GOLF—LARRY NELSON sank an eight-foot birdie putt on the final hole to complete a sibling final-round nine-under-par 63 and win $108,000 and the Walt Disney World Golf Classic in Lake Buena Vista (Fla.). Starting the day six strokes behind, Nelson shot a 20-under-par 268 overall to finish one stroke ahead of Morris Hatalsky and Mark O'Meara.

HARNESS RACING—NAN'S CATCH ($5.40), driven by Berndt Lindstedt, defeated Traffic Jam S by 3¾ lengths to win $192,956 and the Breeder's Crown race for 2-year-old fillies at Hazel Park, Mich. Nan's Catch covered the mile in a track-record 2:00[2/5].

HOCKEY—Winnipeg ran its record to 3-0 with victories over Calgary and Minnesota before finally succumbing to the Blackhawks 6-4. Goaltender Daniel Berthiaume allowed just four goals in the Jets' two wins, while veteran Dale Hawerchuk had four points in the 5-2 victory over the North Stars. Chicago streaked to the top of the Norris Division on the strength of a 3-0 week that included two victories, 5-3 and 3-2, over the winless Blues. The Islanders and Flyers divided a pair as New York trounced Philadelphia 6-0 on a shutout by goaltender Kelly Hrudey, and the Flyers returned the favor two days later by handing the Islanders their first home-opener loss in eight years, 4-3, on Brian Dobbin's goal with :22 remaining. The Rangers suffered their first defeat of the season, 4-3 to Washington, when the Capitals charged from behind and got two goals in the last three minutes by Rod Langway and Dale Hunter. Hartford ended a five-game losing streak, defeating New Jersey 4-3 on an overtime goal by Sylvain Turgeon. The Penguins remained in the thick of the Patrick Division race, largely on the strength of superstar Mario Lemieux, who amassed 11 points in four games to take over the league scoring leadership.

HORSE RACING—FORTY NINER ($8.60), with Eddie Maple aboard, defeated Parlay Me by 4¼ lengths to win $370,800 and the Champagne Stakes, at Belmont Park. The 2-year-old colt's time for the mile was 1:36[4/5].

River Memories ($21.70), ridden by Chris McCarron, finished a head in front of Sadjiyd to win $456,900 and become the first 3-year-old filly to win the Rothmans International, at Woodbine in Toronto. River Memories was clocked in 2:32[4/5] for the 1½ miles.

MOTOR SPORTS—NIGEL MANSELL of England, driving a Williams-Honda, beat Nelson Piquet of Brazil by 26.176 seconds to win the Mexican Grand Prix, in Mexico City. Mansell averaged 168 mph for 63 laps on the 2.75-mile course.

TENNIS—IVAN LENDL easily defeated Pat Cash 6-4, 6-2, 6-4 to win $55,000 and the Australian Indoor Tennis Championship, in Sydney. Cash had defeated Lendl in their two previous matches this year.

Martina Navratilova celebrated her 31st birthday by defeating Chris Evert 7-5, 6-1 in a Virginia Slims event in Filderstadt, West Germany, to win $36,000.

TRACK & FIELD—JUMA IKANGAA of Tanzania won the Beijing Marathon in 2:12:19, finishing 30 seconds ahead of Negasi Dube of Ethiopia.

MILEPOSTS—ACQUITTED: By a Palm Beach, Fla., circuit court jury, former NHL left wing BRIAN SPENCER, on first-degree-murder charges in the killing of Michael Dalfo, a West Palm Beach restaurateur who was shot twice in the head on Feb. 4, 1982 (SI, May 11). No physical evidence linked Spencer with the murder, and bartender Martin Malvaso testified that Spencer was in his bar at the time of the killing. The jury deliberated for just one hour before reaching a verdict.

NAMED: By the Cincinnati Reds, as their new general manager, MURRAY COOK, 46, the former G.M. of the Montreal Expos, replacing BILL BERGESCH, 60, Cincinnati's G.M. since 1984.

PURCHASED: For an NBA-record $44.5 million, the PHOENIX SUNS, by a group headed by Jerry Colangelo, the team's executive vice-president and general manager, who said the purchase was intended to keep the team in Phoenix.

RETIRED: Defenseman BARRY BECK, 30, after nine NHL seasons with the Colorado Rockies and the New York Rangers. Beck, who was attempting a comeback with the Rangers after sitting out the '86-87 past season, reinjured his left shoulder during an exhibition game against the Winnipeg Jets.

TRADED: By the Chicago Bears, quarterback DOUG FLUTIE, 25, to the New England Patriots for an undisclosed middle-round draft pick in 1988 or '89.