BOXING—MARVIN JOHNSON of the U.S. stopped Jean-Marie Emebe of Cameroon in the 13th round of their scheduled 15-round bout to retain the WBA light heavyweight championship, in Indianapolis.
PRO FOOTBALL—Wesley Walker caught a 21-yard touchdown pass from Ken O'Brien on the last play of regulation, then snared his fourth TD reception of the game 2:35 into overtime to cap the Jets' wild 51-45 victory over Miami at the Meadowlands. Walker's performance (6 catches, 174 yards, 4 TDs), and O'Brien's artistry—he completed 29 of 43 passes for a career-high 479 yards—offset another record-setting performance by Miami's Dan Marino, who hit 30 of 50 passes for 448 yards and a career-high 6 TDs. The teams' combined 884 yards passing broke the NFL record of 883 set by the Bengals and Chargers in 1982. But while Marino moved atop the NFL's alltime passing ratings last week, supplanting San Francisco's Joe Montana, who was out for the season after undergoing back surgery, the Jets moved into a tie for the AFC East lead with the New England Patriots, who lost 38-31 to AFC West coleader Seattle, in Foxboro, Mass. Denver, tied at 3-0 with the Seahawks for first in the AFC West, rolled to a 21-10 Monday-night victory at Pittsburgh, and so overpowered the Eagles in a 33-7 win in Philadelphia that backup quarterback Gary Kubiak played almost the entire second half. In Minneapolis, the Vikings hammered Pittsburgh 31-7. For the woeful Steelers, who have scored just 17 points in three losses, their 0-3 start is the worst since 1970. AFC Central leader Cincinnati's 30-13 victory in Cleveland Thursday night was the Bengals' fifth triumph over the Browns in their last six meetings, while Tampa Bay's 24-20 win at Detroit was the Bucs' first on the road since 1983. The Rams cruised past Indianapolis 24-7 in the Hoosier Dome, while out in L.A., the 0-3 Raiders, off to their worst start in 22 years, lost to the Giants 14-9. In Buffalo, the Bills won for just the fifth time in their last 38 games when they beat St. Louis 17-10. Kansas City rolled past visiting Houston 27-13, while in San Diego, Jay Schroeder's 14-yard scoring pass to Gary Clark with 1:16 to play rallied Washington to a 30-27 victory over the Chargers and snapped San Diego's seven-game home-field winning streak. In San Francisco, Jeff Kemp hit 29 of 44 passes for 332 yards and one touchdown in the 49ers' 26-17 triumph over New Orleans. Atlanta, now tied 3-0 with the Rams for first place in the NFC West, rallied for a 37-35 upset victory at Dallas when Mick Luckhurst kicked an 18-yard field goal with 20 seconds left (page 72).
GOLF—CORY PAVIN sank a 10-foot putt for a birdie on the fourth playoff hole to defeat Dave Barr and win the $72,000 first prize at the Greater Milwaukee Open. Pavin and Barr had completed regulation play tied at 16-under-par 272.
Patty Sheehan sank a 15-foot birdie putt on the first hole of a playoff to beat Ayako Okamoto, Amy Alcott and Betsy King and win an LPGA event, in San Jose. The foursome had finished 54 holes tied at 4-under-par 212. Sheehan's victory was worth $41,250.
HARNESS RACING—BARBERRY SPUR ($3.20), driven by Bill O'Donnell, defeated Amity Chef by 1� lengths in a race-off to win the Little Brown Jug at the Delaware County ( Ohio) Fairgrounds and claim the second jewel of pacing's Triple Crown. The 3-year-old colt, who won $150,841, was timed at 1:52[4/5] for the mile. Barberry Spur won the Cane Pace at Yonkers Raceway last July, and if he wins the Messenger Stakes at Roosevelt Raceway on Oct. 4, he will become the first Triple Crown winner since Ralph Hanover in 1983.
HORSE RACING—MANILA ($3.80), ridden by Jose Santos, won the Grade I Turf Classic at Belmont by a nose over Damister to earn the $423,150 winner's purse. The 3-year-old's time for the 1� miles was 2:27[4/5].
Wise times ($3.40), with Eddie Maple in the saddle, rallied to defeat Cheapskate and Southern Halo in the Grade I Super Derby by half a length, at Louisiana Downs. Wise Times, a 3-year-old colt, earned $300,000 for the triumph and ran the 1� miles in a time of 2:04.
Lady's secret ($3), with Pat Day in the irons, won the Ruffian Handicap at Belmont by eight lengths over Steal a Kiss. The 4-year-old filly, who earned a winner's purse of $138,240, ran the 1? miles in a stakes-record 1:46[4/5].
MOTOR SPORTS—NIGEL MANSELL of England drove a Williams- Honda to victory in the Portuguese Grand Prix in Estoril, averaging 116.599 mph on the 2.7-mile course to defeat Alain Prost of France, in a McLaren-TAG- Porsche, by 18.772 seconds. Mansell increased his lead in the World Drivers' championship standings to 10 points over Nelson Piguet of Brazil.
Rusty Wallace, in a Pontiac, won the 500-lap NASCAR event in Martinsville, Va., by a car length over Geoff Bodine, in a Chevrolet. Wallace, who won $40,175, averaged 73.191 mph on the .526-mile Martinsville Speedway track.