HORSE RACING—RIVA RIDGE ($3.40) set a track record of 1:47 for 1? miles and won the $57,200 Stuyvesant Handicap at Aqueduct. The Meadow Stable colt, ridden by Eddie Maple, finished three lengths ahead of Forage.
Step Nicely ($17.40), Angel Cordero Jr. up, overtook favored Linda's Chief on the turn and held off Forego in the stretch to win the $58,000 Jerome Handicap at Aqueduct by a head in race record time of 1:34 for the mile.
MOTOR SPORTS—DAVID PEARSON, driving a Mercury, cruised to an easy victory in the $107,200 American 500 at Rockingham, N.C. for his 11th win in 18 races this season.
TENNIS—Australian ROSS CASE, 21, earned $5,000, his largest purse as a pro, winning the Manila Open over countryman Geoff Masters 6-1, 6-0.
Tom Okker won the Melia Tournament and $14,500 with a 4-6, 6-3, 6-3, 7-5 triumph over Chile's Jaime Fillol in Madrid. Okker moved into second place in the Grand Prix standings behind Ilie Nastase, whom he upset in the semifinals.
Vijay Amritraj outlasted Australian veteran Mai Anderson 6-4, 5-7, 7-9, 6-3, 11-9 to win the first Indian Grand Prix International and $5,000 in New Delhi.
MILEPOSTS—FIRED: Head coach of the Houston Oilers, BILL PETERSON, after a 1-18 record over two seasons. General Manager Sid Gillman takes over for the rest of this year.
NAMED: NEILL McGEACHY, 31, an assistant at Duke, as head basketball coach, replacing Bucky Waters, who resigned last month.
DIED: President of the United States Golf Association, LYNFORD LARDNER JR., 58; in Milwaukee.
DIED: A.M. (Tonto) COLEMAN, 66, former commissioner of the Southeastern Conference; in Abilene, Texas; of an apparent heart attack.