A roundup of the week Aug. 6-12

BOWLING—LISA RATHGEBER of Palmetto, Fla. was a 248-191 victor over Aleta Sill in the finals of the LPBT's $25,000 Joliet (Ill.) Classic.

Mark Williams of Beaumont, Texas defeated Pete McCordic 257-157 to win the PBA's $100,000 Waukegan (Ill.) Open.

CYCLING—LEONARD HARVEY NITZ of Sacramento won the one-km race at the U.S. Cycling Federation's national championships in Trexlertown, Pa. in 1:07.41. Second, 1:08.91, was Steve Hegg, the gold medalist in the 4,000-meter individual pursuit at the Los Angeles Olympics.

Two silver medalists at L.A.—REBECCA TWIGG of Colorado Springs and NELSON VAILS of New York—were winners. Twigg took the 4,000-meter match pursuit with a time of 3:52.59 and Vails won the men's 1,000-meter sprint in which his 200-meter times were 11.26 and 11.43.

HARNESS RACING—ANDREL ($3.40) won the $240,586 Adios Pace for 3-year-olds with consecutive victories at the Meadows in Meadow Land, Pa. After a 1½-length triumph over Holmes Hanover in a 1:56.8 first heat, the winner, driven by John Campbell, beat Fame by 3¼ lengths in 1:54.2.

HORSE RACING—LIFE'S MAGIC ($3.60) beat stablemate Lucky Lucky Lucky by a head in the $141,000 Alabama Stakes for 3-year-old fillies at Saratoga. The winner, ridden by Jorge Velasquez, covered the 1¼ miles in 2:02[3/5].

MOTORCYCLING—EDDIE LAWSON of Ontario, Calif. rode his Yamaha to victory in the 500-cc class at the Swedish Grand Prix in Anderstorp. He also clinched the world championship with a total of 134 points.

MOTOR SPORTS—NEIL BONNETT passed Cale Yarborough on the final lap and finished first in the last event of the International Race of Champions series at Michigan International Speedway in Brooklyn, Mich. Bonnett averaged 148.392 mph for the 100 miles. Yarborough, however, won the overall four-race IROC series with 58 points, three more than Bonnett, and earned $150,000.

XXIII OLYMPIC GAMES—World records were set in Los Angeles by these competitors: SAM GRADDY, RON BROWN, CALVIN SMITH and CARL LEWIS in the 4 X 100-meter relay final, with a time of 37.83; TRACIE RUIZ in synchronized swimming, with a qualifying-round score of 197.667; archer DARRELL PACE, who scored 601 points at 90 meters and 2,616 overall; and GREG LOUGANIS, who scored 710.91 points in platform diving.

SOCCER—NASL: Golden Bay, last in the Western Division, got three goals from Branko Segota in a 6-3 win over Eastern Division leader Chicago. The Sting then upped its lead over the Cosmos to 12 points by scoring twice in the last five minutes of regulation time at Vancouver and going on to win 5-4 in OT. New York lost 3-2 in Minnesota as Alan Wiley scored twice. San Diego was a 5-1 winner over Tampa Bay on Sunday and Golden Bay remained in the cellar as it lost to Toronto 5-3 despite three more goals by Segota.

TENNIS—MANUELA MALEEVA of Bulgaria defeated Lisa Bonder 6-4, 6-3 in the women's singles of the $574,000 U.S. Open Clay Court championships in Indianapolis. The men's title went to ANDRES GOMEZ of Ecuador, who beat Balazs Taroczy of Hungary 6-0, 7-6.

Terry Moor won his first tournament since 1979 by rallying to beat Marty Davis 3-6, 7-6, 6-2 in the $ 100,000 Western Open in Cleveland.

Joakim Nystrom of Sweden beat Tim Wilkison 6-2, 7-5 to win the $225,000 Volvo International tournament in North Conway, N.H.

MILEPOSTS—NAMED: As athletic director at the University of Colorado, BILL MAROLT, 40, alpine director of the U.S. Ski Team since 1979. Marolt, who will assume his duties on Sept. 1, replaces Eddie Crowder, who resigned.

PURCHASED: For $4.6 million, by ROBERT SANGSTER of Great Britain, in a bidding war with Sheik Mohammed ibn Rashid al-Maktoum of Dubai, a colt by Northern Dancer out of Bubbling, at the Saratoga Select Yearling Sales in Saratoga Springs, NY. It was the seventh-highest price ever for a yearling and the highest ever at Saratoga.

TRADED: By the Atlanta Hawks, guard JOHNNY DAVIS, 28, to the Cleveland Cavaliers for guard STEWART GRANGER, 22, and forward JOHN GARRIS, 25.

By the Houston Rockets, center CALDWELL JONES, 34, to the Chicago Bulls for guard MITCHELL WIGGINS, 24, as well as second- and third-round selections in next year's NBA player draft.

By the Vancouver Canucks, left wing DAVID WILLIAMS, 30, the possessor of the NHL record for most career penalty minutes (2,994), to the Detroit Red Wings for left wing ROB McCLANAHAN, 26.