A roundup of the week July 29-Aug. 4

BOWLING—BOB CHAMBERLAIN defeated Jim Pencak 245-215 to win his second PBA title and $18,000, in Waukegan, Ill.

BOXING—CHANG JUNG KOO of South Korea retained his WBC light flyweight title by winning a unanimous 12-round decision over Francisco Montiel of Mexico.

John Collins of Chicago scored a second-round TKO over Mark Holmes of Easton, Pa. to win the vacant USBA middleweight title, in Scranton, Pa.

CYCLING—At the United States Cycling Federation road cycling championships in Milwaukee, WAYNE STETINA of Chatsworth, Calif. beat Gerry Fornes of Columbus, Ohio in the 118-mile race to win his fifth national title. In the women's 60-mile race, REBECCA DAUGHTEN of Carmel, N.Y. won her second consecutive national championship, defeating Kelly Kittredge of South Pasadena, Calif. in a sprint finish.

GOLF—SCOTT VERPLANK won on the second hole of a sudden-death playoff at a tour event in Oak Brook, Ill. to become the first amateur to win a PGA tournament since Gene Littler did it in 1954. Verplank finished regulation play at a nine-under-par 279 along with runner-up Jim Thorpe, who will receive the first-place check of $90,000 because of Verplank's amateur status (page 9).

Penny Hammel beat Nancy Lopez by one stroke to win her first LPGA tournament, in Toledo. The 23-year-old rookie, who earned $26,250, shot a final-round 65 for a 10-under-par 278.

Dana Lofland, 17, of Oxnard, Calif. won the U.S. Girls' Junior Championship at the St. Clair Country Club in Pittsburgh, defeating Amy Fruhwirth, 17, of Cypress, Calif. 4 and 3.

Ian Baker-Finch fired a final-round 66 for a 14-under-par 274 total to win the Scandinavian Open in Stockholm. Graham Marsh finished two strokes back to place second.

HARNESS RACING—PRAKAS ($2.60), driven by Bill O'Donnell, won the Hambletonian, the second leg of trotting's Triple Crown for 3-year-olds, at the Meadowlands in New Jersey.

In other Meadowlands races, two world records were set. O'Donnell drove NIHILATOR ($2.10) to an alltime best for pacers with a mile clocking of 1:49⅗ eclipsing the 1:50[3/5] mark he shared with Colt Fortysix; and MAY WINE ($7), four months in foal to Niatross, set a world mark for a pacing mare, as John Campbell drove her to a 1:52[3/5] mile.

HORSE RACING—TRACK BARRON ($6.40), ridden by Angel Cordero Jr., won the Whitney Handicap at Saratoga racetrack by half a length over Carr de Naskra, covering the 1‚⅛ miles in 1:47[3/5]. The 4-year-old picked up $160,680 for the victory.

Ladies' Secret ($22.20), Jorge Velasquez in the saddle, outran the 1-2 favorite Mom's Command to win the Test Stakes at Saratoga racetrack. The 3-year-old filly, who won $99,620, ran the seven furlongs in 1:21[3/5].

After favored Smile was scratched, long-shot FLARE DANCER, under Randy Romero, ran 1‚⅛ miles in 1:55[1/5] to win the Omaha Gold Cup at Ak-Sar-Ben for the biggest winning payoff ($59.00) in Gold Cup history.

MOTORCYCLING—FREDDIE SPENCER, riding a Honda, took first place in the 81.96-mile British 500 cc. Grand Prix at Silverstone, defeating runner-up Eddie Lawson, who rode a Yamaha, by 1:08. In an earlier race, Spencer finished fourth to clinch the 250 cc. world championship.

MOTOR SPORTS—MICHELE ALBORETO of Italy drove his Ferrari to victory at the German Grand Prix in N√ºrgburgring to defeat runner-up Alain Prost of France in a McLaren-Porsche and increase his lead to five points over Prost in the Formula One drivers' point standings. Alboreto averaged 118.77 mph for the 67 laps over the 2.82-mile course.

Jacques Villeneuve of Canada, driving a March 85C Cosworth, won his first Indy car race, in a 200-mile event in Elkhart Lake, Wis., finishing 10.02 seconds ahead of Michael Andretti, also in a March 85C Cosworth. Villeneuve averaged 114.066 mph over the four-mile Road America course.

POWERBOATING—GEORGE MORALES of Miami won the Miami-New York Chapman Challenge in 19 hours and 31 minutes to break the 11-year-old course record by three hours and 10 minutes. Al Copeland of Metairie, La. was the only other finisher, with a time of 20 hours, 32 minutes.

TENNIS—In quarterfinal Davis Cup play, West Germany, led by Wimbledon champion Boris Becker, beat the U.S. for the first time in 72 years (page 28).

Jimmy Connors won $30,000 and his first tournament this year by defeating Gene Mayer 2-6, 6-3, 6-4, in Stowe, Vt.

Claudia Kohde-Kilsch beat Pam Shriver 6-2, 6-3 to win $40,000 and a tournament in Manhattan Beach, Calif.

TRACK & FIELD—STEVE CRAM of Great Britain broke his third world record in 19 days to match countryman Sebastian Coe's 1981 feat. Cram ran the 2,000 meters in 4:51.39 at a meet in Budapest, shaving .01 second off the 1976 record of John Walker of New Zealand.

MILEPOSTS—ANNOUNCED: By the USFL, a merger of the New Jersey Generals and the Houston Gamblers (page 9). Jerry Argovitz, the principal owner of the Gamblers until the club's sale to New York investors two weeks ago, will be the merged team's president and chief of football operations.

DESTROYED: By a fire of undetermined cause, the 58-year-old clubhouse and grandstand at Arlington Park racetrack, in Arlington Heights, Ill. The Budweiser Million, which had been scheduled at Arlington on Aug. 25, will be held at Hawthorne Race Course.

HIRED: As coach of the Montreal Canadiens, JEAN PERRON, 38, former assistant to Jacques Lemaire, 39, who resigned July 29.

As basketball coach at Wake Forest, BOB STAAK, 37, former Xavier University coach. He replaces Carl Tacy, who resigned last month.

INDUCTED: By the Pro Football Hall of Fame, JOE NAMATH, 42; ROGER STAUBACH, 43; O.J. SIMPSON, 38; FRANK GATSKI, 63; and PETE ROZELLE, 59; in Canton, Ohio.

TRADED: By the Cleveland Indians, pitcher BERT BLYLEVEN, 34, to the Minnesota Twins in a waiver deal for relief pitcher CURT WARDLE, 24, and two minor league players.

By the Pittsburgh Pirates, pitchers JOHN CANDELARIA, 31, and AL HOLLAND, 32, and outfielder GEORGE HENDRICK, 35, to the California Angels for outfielder MIKE BROWN, 25, pitcher PAT CLEMENTS, 23, and an unidentified player.