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.