A roundup of the week July 31-August 6

BOXING—HUGO CORRO of Argentina retained his world middleweight title with a 15-round decision over Ronnie Harris of Canton, Ohio, at Buenos Aires.

DIVING—CYNTHIA POTTER of Houston got a record 27th career national title by winning the women's one-meter springboard at the AAU championships in Mission Viejo, Calif. Other winners: GREG LOUGANIS in the men's one-meter springboard and the men's 10-meter platform; JIM KENNEDY in the men's three-meter springboard; JENNIFER CHANDLER in the women's three-meter springboard; MELISSA BRILEY in the women's 10-meter platform.

GOLF—JOHN MAHAFFEY defeated Tom Watson and Jerry Pate on the second hole of sudden death to win the PGA Championship at Oakmont, Pa. (page 16).

Nancy Lopez shot a final-round, one-under-par 73 for a 72-hole total of 289, seven under par, to win the $100,000 European Open by three strokes.

HARNESS RACING—FALCON ALMAHURST ($5.80), driven by Billy Haughton, won the $560,000 Meadowlands Pace by two lengths over Abercrombie. The 3-year-old was timed in 1:55[1/5] (page 60).

HORSE RACING—ALYDAR ($3.40), Jorge Velasquez up, won the $82,575 Whitney Stakes at Saratoga by 10 lengths over Buckaroo. The 3-year-old ran the mile and an eighth in 1:47[2/5] (page 53).

MOTOR SPORTS—LENNY POND, driving an Oldsmobile, averaged 174.7 mph, a record for a 500-mile race, while winning the first Grand National race of his career, the $217,150 Talladega 500 at Talladega, Ala.

A. J. Foyt, in a Coyote, averaged 159.047 mph on the two-mile Texas World Speedway oval to win the 200-mile Texas Grand Prix at College Station over Johnny Rutherford in a McLaren.

SOCCER—NASL: Vancouver, which set the league record for consecutive victories (10) last week, added three more wins to its total and shared the best winning percentage (.800) in the league with the Cosmos as the regular season ended. The Whitecaps routed the Earthquakes 6-0 on Kevin Hector's hat trick, then defeated San Diego 2-1. Seattle won three games and qualified for a playoff berth in the National Conference. The Sounders beat Portland 3-2 when Mickey Cave scored the winning goal in overtime; Oakland 2-1 in a shootout; and California 5-2. That win eliminated Dallas from playoff consideration, despite the Tornado's subsequent 5-3 win over the Cosmos. Jeff Bourne of the Tornado scored four goals, three of them in a four-minute, 24-second stretch of the first half, a league record. Minnesota clinched first place in the National Conference Central, beating Los Angeles 5-0 and Colorado 2-0. Washington held on to second place in the National Conference East, although losing to Toronto 2-0. The Diplomats lost to the Cosmos 2-1 when Jimmy Steele kicked the ball into his own goal. Detroit defeated New England 1-0 and kept the Tea Men from clinching first place in the American Conference East, at least for one game. New England beat Memphis 3-2 in overtime and edged Tampa Bay, which defeated Toronto 5-1 and Houston 3-2, for first place. The loss eliminated Houston from a playoff berth. Philadelphia qualified by defeating Detroit 3-2 and Rochester 3-2, helping to ruin the Lancers' playoff hopes. San Jose defeated Oakland 2-1, knocking the Stompers out of the playoffs.

ASL: Southern California has taken six straight, nine of its last 10 and has moved into a second-place tie with Los Angeles in the West. The Lazers beat Sacramento 3-0, with Sid Wallace getting a goal and an assist, while John Granville got his fifth shutout in the last six games. Wallace is the league's scoring leader with 31 points. Granville, who has given up just one goal in the last six games, lowered his league-leading goals-against average to 0.69.

SWIMMING—TRACY CAULKINS established a world record in the women's 200-meter individual medley with a time of 2:15.09 at the National AAU Long Course championships at The Woodlands, Texas. Also setting world records were STEVE LUNDQUIST, 2:04.39 in the men's 200 individual medley; JESSE VASSALLO, 4:23.39 in the men's 400 individual medley; KIM LINEHAN, 4:07.66 in the women's 400 freestyle (page 24).

At the Commonwealth Games in Edmonton, Alberta, 15-year-old TRACEY WICKHAM of Australia broke her own world record in the 800-meter freestyle with a time of 8:24.62 (page 57).

TENNIS—WTT: San Diego won three matches and maintained its 3½-game lead over Los Angeles in the West. The Friars defeated Anaheim 26-21, Phoenix 31-15 and New York 31-18. Los Angeles also won three to stretch its winning streak to eight. Chris Evert defeated Nancy Richey 6-3 and Ilie Nastase beat Mark Cox 6-1 as the Strings whipped Anaheim 31-21, then Ann Kiyomura and Nastase teamed to knock off Frew McMillan and liana Kloss 6-3 in mixed doubles to give Los Angeles a 27-20 victory over the Golden Gaters in the first of a home-and-home series in Los Angeles. The next night the Strings defeated the Gaters in Oakland 23-18 in overtime. In the East, Boston won two of three and opened up a 10-game lead over the New Yorkers.

TRACK & FIELD—KARL-HANS RIEHM of West Germany set a world record in the hammer throw at Heidenheim, West Germany, his toss of 263'6" being seven inches better than the old record.

Sara Simeoni of Italy broke the world record in the women's high jump with a leap of 6'7" at Brescia, Italy, a quarter of an inch better than the mark established by Rosemarie Ackermann of East Germany last year.

VOLLEYBALL—Tucson, winning four matches in five nights, clinched its first playoff berth in the franchise's history. The Sky defeated San Diego in five games, Seattle in three straight and ended Santa Barbara's six-match winning streak before returning home to defeat Denver. The Comets, who are in a race with El Paso-Juarez for the other Continental Division playoff spot, beat San Diego in five games but lost to Seattle and Orange County as their road record fell to 3-14. Seattle, which has won seven of eight, defeated San Diego in five games.

MILEPOSTS—NAMED: GENE SHUE, 46, as coach of the NBA's new San Diego franchise. Shue, who was fired as coach of the Philadelphia 76ers six games into the 1977-78 season, has a 448-434 record in 12 years as an NBA head coach.

SOLD: By owners Edward and Peter Bronfman, the Stanley Cup champion MONTREAL CANADIENS, to Molson Breweries of Canada, Ltd. for a reported $20 million.

DIED: EARL (DUTCH) CLARK, 71; of cancer; in Canon City, Colo. One of 17 charter members of the Pro Football Hall of Fame, Clark, a star at Colorado College, was a quarterback for the Detroit Lions from 1934 to 1938 and coached the Lions in 1937-38.

DIED: JESSE (POP) HAINES, 85, former major league baseball player, at Phillipsburg, Ohio. A pitcher with the Cardinals from 1920 to 1937, Haines had a 210-158 record, pitched a no-hitter and won three World Series games. He was elected to the Hall of Fame in 1970.