MOTOR SPORTS—NIKI LAUDA drove his McLaren- Porsche to victory in the South African Grand Prix, averaging 128.38 mph over 75 laps on the 2.55-mile Kyalami course. He defeated Alain Prost, also in a McLaren- Porsche, by 1:08.
Tim Richmond averaged 97.837 mph in his Pontiac to win a $227,290, 250-mile NASCAR race on the five-eighths mile North Wilkesboro ( N.C.) Speedway oval. He finished less than a second ahead of Harry Gant, who drove a Chevy.
INDOOR SOCCER—MISL: Eastern Division leader Baltimore won twice, beating Cleveland (5-3) and Buffalo (6-4). In the West, St. Louis held on to a 1� game margin by defeating Tacoma 7-6 in overtime and Memphis 6-5.
NASL: In the championship playoff series, San Diego took a two-game lead over the Cosmos. The Sockers won Game 1 by a 5-2 score, as Jean Will-rich and Kaz Deyna scored twice, and then triumphed 10-4 as Hugo Perez had a hat trick.
TENNIS—HANA MANDLIKOVA defeated Helena Sukova 7-5, 6-0 to win a $150,000 indoor tournament in Boston.
Mark Dickson defeated Sammy Giammalva 6-3, 6-2 to win the $250,000 River Oaks tournament in Houston.
MILEPOSTS—FIRED: As coach of the Los Angeles Kings, ROGER NEILSON, 49, who guided the team to an 8-17-3 record after replacing Don Perry on Jan. 30; and as coach of the Toronto Maple Leafs, MIKE NYKOLUK, 49, who had a 3�-year record of 89-144-47.
HIRED: As coach of the revived basketball program at the University of San Francisco, JIM BROVELLI, 42, who had a record of 160-130 in 11 years at the University of San Diego; as basketball coach at Clemson, CLIFF ELLIS, 38, who had a nine-year record of 171-84 at South Alabama; and as basketball coach at Lafayette College, BUTCH VAN BREDA KOLFF, 61 (SI, Feb. 20).
REINSTATED: As of May 15, by an arbitrator, outfielders WILLIE WILSON of the Kansas City Royals and JERRY MARTIN of the New York Mets, who had received one-year suspensions from baseball last Dec. 15 after being convicted of attempting to possess cocaine.