A Roundup Of The Week May 25-june 1

BOWLING—EARL ANTHONY became the first to win three straight Brunswick-PBA National Championships by defeating Jim Frazier, 245-180, in Downey, Calif. Anthony earned $9,000 to bring his 1975 winnings to $68,560.

BOXING—WBC middleweight champion RODRIGO VALDES of Colombia knocked down Argentinian Ramon Mendez seven times en route to an eight-round TKO in a title bout at Cali, Colombia.

Alexis Arguello of Nicaragua stopped challenger Rigoberto Riasco of Panama in the second round on a TKO to retain his WBA featherweight title in Granada, Nicaragua.

GOLF—HALE IRWIN shot a final-round four-under-par 68 for a course-record 271 total to win the Atlanta Golf Classic and $45,000. It was his first tour victory since last year's U.S. Open. Tom Watson was second, four strokes back.

Kathy Whitworth moved into 11th on this year's money-wnning list with her first tour victory in 15 months, winning her third LPGA championship and $8,000 in Baltimore with an even-par 73 for a 288, one stroke ahead of Sandra Haynie.

The U.S. won its 22nd Walker Cup victory in 25 matches, at St. Andrews in Scotland, defeating Britain 15� to 8�.

HARNESS RACING—Three-year-old pacer NERO ($2.60), Joe O'Brien at the reins, captured the $52,500 Cane Prep Final by 2� lengths over Shirley's Beau at Yonkers Raceway. In winning his 16th race in 17 starts, the colt was timed in 1:59 for the mile.

HOCKEY—NHL: The Philadelphia Flyers took their second straight Stanley Cup by shutting out the Buffalo Sabres 2-0 in Buffalo's Memorial Auditorium to take the series 4-2 (page 72).

HORSE RACING—SINGH ($4), ridden by Angel Cordero, captured the $135,600 Jersey Derby by three lengths over Honey Mark, covering the 1? miles in 1:50[4/5] at Garden State Park.

Unbeaten RUFFIAN ($2.20), Jacinto Vasquez in the saddle, romped to her ninth straight triumph, this time by 13� lengths over Sweet Old Girl in the 1?-mile Mother Goose at Aqueduct. Her time was a stakes record 1:47[4/5].