A roundup of the week Aug. 19-25

BASEBALL—Seoul, South Korea defeated Mexicali, Mexico 7-1 to win the Little League World Series, at Williamsport, Pa. The U.S. team, from Morristown, Term., lost in the semifinals. It was the first time the U.S. was not represented in the title game.

BOWLING—TISH JOHNSON of Downey, Calif. won the LPBT Eastern Open in Rochester, N.Y., defeating Carol Norman of Ardmore, Okla. 185-167.

BOXING—LONNIE SMITH of Denver knocked out WBC super lightweight champion Billy Costello of Kingston, N.Y. in the eighth round of a bout in New York City.

CYCLING—At the world championships in Bassano del Grappa, Italy, KOICHI NAKANO of Japan outsprinted countryman Yoshiyuchi Matsueda to win his ninth consecutive professional sprint title. CONNIE PARASKEVIN of Indianapolis won the only U.S. medal—a silver in the women's match sprint.

EQUESTRIAN—MELANIE SMITH of Litchfield, Conn., riding Calypso, won the U.S. Grand Prix League's U.S. Cup, the world's richest show-jumping competition, in Culpeper, Va. She earned the $50,000 first prize in a jump-off in which she had no faults.

GOLF—ROGER MALTBIE fired a 12-under-par 268 to defeat Denis Watson by four strokes at the World Series of Golf in Akron. Maltbie earned $126,000. Curtis Strange's 32nd-place money of $6,750 boosted his season's earnings to $534,331, a PGA record.

The United States won the 30th Walker Cup matches, edging the team from Britain and Ireland 13-11, at the Pine Valley Golf Club, Clementon, N.J. (page 20).

Pat Bradley sank a six-foot birdie putt on the second hole of sudden-death playoff to win $45,000 and an LPGA event in Denver. Bradley and Amy Alcott were tied at 4-under-par 284 after regulation play.

Steve Termeer of Conroe, Texas shot a 292 for 54 holes, beating John Aber of Greensburg, Pa. by five strokes to win the boys' PGA Junior Championship in Palm Beach Gardens, Fla. In the girls' division, JEAN ZEDLITZ of Pleasanton, Calif. defeated Dana Lofland of Oxnard, Calif. by one stroke with a 12-over-par 300.

HARNESS RACING—CHAIRMANOFTHEBOARD ($5.40), driven by John Campbell, defeated Falcon Seelster by a nose to win the Cane Pace, the second leg of the Triple Crown for 3-year-olds of that gait. The colt covered the mile at Yonkers Raceway in 1:55[1/5] and earned $210,000.

HORSE RACING—TELEPROMPTER ($30.40), ridden by Tony Ives, defeated 12 opponents in the Arlington Million, winning by three-quarters of a length over Greinton. The 5-year-old gelding covered the 1¼ miles in 2:03[2/5] to earn $600,000. The race was held as scheduled at Arlington Park near Chicago despite the fact that the track's 58-year-old clubhouse and grandstand were destroyed by fire on July 31.

Basie ($20.60), under Jean Cruguet, finished 1½ lengths ahead of Heatherten to win the Delaware Handicap at Saratoga and $66,360. The 4-year-old filly ran the 1¼ miles in 2:02.

MOTOR SPORTS—NIKI LAUDA of Austria drove his McLaren-Porsche to victory in the Dutch Grand Prix at Zandvoort, defeating Formula One points leader Alain Prost of France, also in a McLaren-Porsche. Lauda averaged 119.98 mph on the 2.642-mile course.

Dale Earnhardt, driving a Chevrolet, averaged 81.388 mph on the Bristol (Tenn.) International Raceway to win a 500-mile NASCAR event. Tim Richmond, in a Pontiac, finished second.

SYNCHRONIZED SWIMMING—CAROLYN WALDO of Canada triumphed in all three events at the World Cup championships in Indianapolis. She won the compulsory figures and the solo competition and paired with countrywoman MICHELLE CAMERON to win the duet event.

TABLE TENNIS—CHEN XINHUA of China beat Andrzej Grubba of Poland 21-16, 21-15, 21-11 for the World Cup title, in Foshan, China.

TENNIS—BORIS BECKER beat Mats Wilander 6-4, 6-2 to win the ATP championship in Mason, Ohio. He earned $48,000.

TRACK & FIELD—SAID AOUITA of Morocco set a world record of 3:29.45 in the 1,500 meters in West Berlin, .22 faster than the five-week-old record of Great Britain's Steve Cram. Earlier, in Zurich, MARY DECKER SLANEY won the women's mile in 4:16.71, eclipsing the 1982 world record of Maricica PuicƒÉ of Romania. On Sunday in Cologne, Slaney lowered her own American 3,000-meter record by .02, winning in 8:29.69, while SYDNEY MAREE set an American record of 3:29.77 in the 1,500 meters, breaking Steve Scott's five-week-old mark of 3:31.76 (page 22).

MILEPOSTS—APPREHENDED: By U.S. marshals and agents of the Customs Service in Albuquerque, fugitive steroids dealer TONY FITTON, 36, who in April had failed to appear in U.S. District Court in San Diego for sentencing after he pleaded guilty to charges arising from his attempt to bring several thousand boxes of anabolic steroids across the Mexican border into the U.S. (SI, May 13).

FIRED: Atlanta Braves rookie manager EDDIE HAAS, 50, who had a 50-71 record. His interim replacement is coach Bobby Wine, 46.

HIRED: As basketball coach at Old Dominion, TOM YOUNG, 52, who had a 239-116 record in 12 years at Rutgers. Young replaces Paul Webb, who resigned in July to become Old Dominion's assistant athletic director.

NAMED: As the head swimming and diving coaches, respectively, at the Boca Raton Mission Bay Aquatic Training Center, MARK SCHUBERT and RON O'BRIEN. They previously coached the Mission Viejo (Calif.) Nadadores Club, the perennial national champion in both sports.

RETIRED: Former WBA lightweight boxing champion RAY (Boom Boom) MANCINI, 24, who had a 29-3 record in his seven-year professional career.

After 12 NHL seasons, Philadelphia Flyer left wing BILL BARBER, 33, who has been suffering from a persistent right knee injury. He had scored 420 goals (a team record) and had made 463 assists.

SIGNED: To a five-year, $2 million contract by the Minnesota Vikings, wide receiver ANTHONY CARTER, 24, who was waived by the USFL's Oakland Invaders. Miami traded the NFL rights to Carter to Minnesota for linebacker ROBIN SENDLEIN, 26, and the Vikings' second-round 1986 draft choice.

TRADED: By the Phoenix Suns, forward MAURICE LUCAS, 32, to the Los Angeles Lakers for their 1988 and 1989 second-round draft choices.