A roundup of the week Aug. 12-18

BOXING—Challenger LUPE PINTOR of Mexico scored a unanimous decision over countryman Juan (Kid) Meza to win the WBC super bantamweight title in Mexico City.

CYCLING—MATT EATON of Pittsburgh outsprinted Tom Schuler of Downer's Grove, Ill. and Bruce Donaghy of Allentown, Pa. to win the 35-mile Mayor's Cup race in 1:04:07, in Chicago. In the women's 15-mile race BETSY DAVIS of Lavallette, N.J. beat Judith Caunter of Hanover, N.H. and Sally Zack of Rockford, Ill. in 29:44.

GOLF—KEN GREEN shot a 20-under-par 268 to win $81,000 and a PGA tour event in Grand Blanc, Mich. Wayne Grady finished four strokes back.

Amy Alcott won $65,000 and an LPGA event in Buford, Ga., after sinking a two-foot birdie putt on the second hole of a sudden-death playoff. Alcott and Patty Sheehan were tied at 14-under-par 274 after regulation play.

Muffin Spencer-Devlin shot a seven-under-par 209 to win $30,000 and her first tour event, in Elmsford, N.Y. She defeated runners-up Kim Shipman and Deedee Lasker by four strokes.

HARNESS RACING—GRADE ONE ($100.40), a 49-1 shot driven by Ray Remmen, covered the mile in 1:54[3/5] to win $672,000 and the Woodrow Wilson Pace at the Meadowlands, the richest event in harness racing. The 2-year-old colt beat Michael Jonathan by a head.

HORSE RACING—CHIEFS CROWN ($4.40), Angel Cordero Jr. in the saddle, covered the 1¼ miles in 2:01[1/5] to win $202,800 and the Travers Stakes at Saratoga (page 80).

Kentucky Derby winner SPEND A BUCK ($3), under Laffit Pincay Jr., won the Monmouth Handicap by a nose over Carr De Naskra at New Jersey's Monmouth Park. Spend a Buck, who earned $162,180 for the victory, ran the 1‚⅛ miles in a track-record 1:46[4/5].

MOTOR SPORTS—ALAIN PROST of France drove his McLaren-Porsche to victory at the Austrian Grand Prix, finishing 30 seconds ahead of Ayrton Senna of Brazil, in a Lotus-Renault, Prost averaged 129.241 for 52 laps on the 3.7-mile Osterreichring.

Rick Mears, driving a March 85C Cosworth, averaged 151.676 mph over the 2.5-mile course at Pocono International Raceway in Long Pond, Pa. to win a 500-mile Indy car race, finishing 2.2 seconds ahead of Al Unser Jr., in a Lola T-900 Cosworth.

POWERBOATING—The VIRGIN ATLANTIC CHALLENGER, a 65-foot aluminum catamaran, sank while trying to beat the 33-year-old transatlantic speed record of three days, 10 hours and 40 minutes held by the passenger liner S.S. United States. The powerboat, owned by Richard Branson and Ted Toleman, was 138 miles short of completing the 2,850-mile New York City to Isles of Scilly, England course when it hit a solid object beneath the surface off the southwest English coast. The nine crew members were rescued unhurt.

SAILING—WEST GERMANY won the 18-nation, five-race, 907-mile Admiral's Cup, a team event along the English coast, with 1,906 points. The United Kingdom, with 1,626 points, was runner-up and New Zealand third with 1,467. The U.S., with 1,120 points, placed ninth. In the 605-mile Fastnet, the last race, Drum, a 77-foot yacht co-owned by singer Simon Le Bon of the rock group Duran Duran, capsized when its keel snapped off in 50-mph winds, trapping Le Bon and five crew members in the hull for 20 minutes until they were rescued.

SWIMMING—MATT BIONDI, who set a world record in the 100-meter freestyle a week earlier at the U.S. Long Course Championships, anchored two world-record-setting American relay teams at the Pan Pacific championships in Tokyo. Biondi teamed with SCOTT McCADAM, MIKE HEATH and PAUL WALLACE to set a 400-meter freestyle record of 3:17.08, eclipsing the previous mark of 3:19.03 set by the U.S. team at the 1984 Olympics. Biondi then joined backstroker RICK CAREY, breaststroker JOHN MOFFET and butterflyer PABLO MORALES to swim the freestyle leg and win the 400-meter relay in 3:38.28, 1.02 seconds faster than the record set by the U.S. team at the '84 Olympics.

TENNIS—JOHN McENROE beat Ivan Lendl 7-5, 6-3 to win $51,000 and a tour event in Montreal.

Kathy Rinaldi earned $26,000 by defeating Steffi Graf 6-4, 3-6, 6-4 at a tournament in Mahwah, N.J.

Christine Gilles, 18, of Plymouth, Mich., defeated 19-year-old Diana Dopson of Austin, Texas 6-3, 6-1 to win the U.S.T.A. women's National Amateur Championship in Kiamesha Lake, N.Y. In the men's title match, BRYAN SHELTON, 19, of Huntsville, Ala. beat Doug Sachs of Cresskill, N.J., 6-3, 3-6, 7-6.

TRACK & FIELD—MARY DECKER SLANEY broke her two-year-old American record in the 800-meter run with a time of 1:56.90 in Bern, Switzerland. Her old record was 1:57.60.

WATER SKIING—CARL ROBERGE, 21, and his sister, KARIN ROBERGE, 22, both of Orlando, Fla. placed first in the men's and women's divisions at the U.S. open championships in Du Quoin, Ill.

MILEPOSTS—ESTABLISHED: By the Boston Athletic Association's Board of Governors, a $250,000 prize-money pool for the Boston Marathon. The B.A.A. had voted in July to break with race precedent and award prize money, but the amount had not been determined.

HIRED: As basketball coach at Ohio's Xavier University, PETE GILLEN, 38, a former Notre Dame assistant. He replaces Bob Staak, 37, who resigned earlier this month.

As coach of the New Jersey Nets, former Los Angeles Laker assistant DAVE WOHL, 35. He replaces Stan Albeck, 54, who resigned in June and became the coach of the Chicago Bulls.

NAMED: STEVE PATTERSON, 37, as the basketball coach at Arizona State for 1985-86. Patterson had been interim coach since Bob Weinhauer was fired in July.

PLACED ON PROBATION: By the NCAA, for three years, SOUTHERN METHODIST UNIVERSITY'S football program, for recruiting violations, most of them involving the school's boosters. In putting SMU on probation for the sixth time since 1958 and fourth since 1974, the NCAA took the unprecedented action of stripping the Mustangs of all 30 scholarships for the 1986-87 academic year and limiting them to 15 the following year. The team also will be barred from bowl play after the 1985 and '86 seasons and from television appearances in '86.

SIGNED: By the Boston Bruins, RAY BOURQUE, 24, to a five-year reported $2.5 million contract that makes him the NHL's highest-paid defenseman.

By the Dallas Cowboys, running back TONY DORSETT, 31, who had been holding out, to a five-year, $9.65 million contract.