MODERN PENTATHLON—Poland's JANUSZ PECIAK won the men's world title in Warsaw with 5,662 points, 13 more than Daniele Masala of Italy.
MOTOR SPORTS—NEIL BONNETT, driving his Ford at 126.410 mph around the 1.366-mile Darlington ( S.C.) International Raceway, won the Southern 500 by a car length over Darrell Waltrip, in a Buick. Bonnett completed the 367 laps in 3:57:57.
Benny Parsons drove his Ford at an average of 69.998 mph around the .542-mile Fairgrounds Raceway track in Richmond, Va. to win a 400-lap NASCAR Grand National event. He took 3:05:50 to cover the 216.8 miles and finished a car length ahead of Harry Gant, who drove a Pontiac.
Alain Prost, averaging 130.653 mph on the 3.59-mile circuit in a Renault, won the Italian Grand Prix in Monza by 22.17 seconds over Alan Jones, in a Williams. Prost covered the 187 miles in 1:26:34.
ROAD RACING—GREG MEYER set an American road record for 20 kilometers, running the distance in 59:08 in New Haven, Conn. He broke Dave Babiracki's two-year-old mark by 31 seconds.
SOCCER—NASL: The Cosmos, San Diego and Chicago joined Fort Lauderdale as playoff semifinalists, all by scoring third-game victories in their best-of-three quarterfinal series. Forward Arno Steffenhagen provided the game-winner in Chicago's 4-2 defeat of Montreal, while San Diego and the Cosmos ousted two Florida-based Cinderella teams, the Sockers beating Jacksonville 3-1 on Julie Veee's goal and Giorgio Chinaglia and Wim Rijsbergen striking in the Cosmos' 2-0 win over Tampa Bay. In the openers of the semifinal series, the Sockers stung the Sting 2-1 on Kaz Deyna's two goals, and the Cosmos reached All-Star Goalkeeper Jan Van Beveren for four goals, including two by Chinaglia, in a 4-3 defeat of Fort Lauderdale.
ASL: Carolina and New York United advanced to the league championship game with victories in home-and-home semifinals. Despite losing 2-1 in double overtime in the second game of their series with Pennsylvania, the Lightnin' advanced on total goals. United's Paul Kitson scored the winning goal that propelled the New Yorkers past Detroit 2-1 in the teams' second encounter, after they had tied 1-1 in their first meeting.
SWIMMING—East Germany's UTE GEWENIGER reduced her two-month-old world record in the women's 100-meter breaststroke by .79 of a second, swimming the distance in 1:08.60 in Split, Yugoslavia.
TENNIS—In Flushing Meadow, N.Y., JOHN McENROE held off Bjorn Borg 4-6, 6-2, 6-4, 6-3 to win his third U.S. Open men's singles title, and TRACY AUSTIN rallied to defeat Martina Navratilova 1-6, 7-6, 7-6 in the women's final (page 18). McEnroe and PETER FLEMING won the men's doubles championship by default over Heinz Gunthardt and Peter McNamara; KATHY JORDAN and ANNE SMITH beat Wendy Turnbull and Rosie Casals 6-3, 6-3 in women's competition. In mixed doubles, Smith and KEVEN CURREN were 6-4, 7-6 winners over JoAnne Russell and Steve Denton in the final.
TRACK & FIELD—LUDMILLA VESELKOVA of the U.S.S.R. set a women's world record of 4:20.89 for the mile, in Bologna, Italy. Mary Decker of the U.S. held the old mark of 4:21.68, which she set in January, 1980.