PRO BASKETBALL—NBA: Elvin Hayes scored 25 points and Bobby Dandridge 34 as Washington defeated Seattle 106-98 to break a nine-game losing streak in championship finals dating back over the past eight seasons and tie their playoff series at one game apiece. But three days later, the Sonics held off a late Bullet surge for a 93-92 victory, taking a 2-1 series lead (page 26).

BOXING—CARLOS PALOMINO retained his WBC welterweight title, winning a unanimous 15-round decision over Armando Muniz in Los Angeles.

GOLF—With a birdie on the final hole, JERRY HEARD shot a tournament-record 19-under-par 269 to win the $200,000 Atlanta Classic. Tom Watson, Bob Murphy and Lou Graham tied for second two strokes back.

HOCKEY—NHL: Montreal defeated Boston in Games 5 and 6 by identical scores of 4-1 to take its third consecutive Stanley Cup championship. The Canadiens are the first team since the 1962-64 Toronto Maple Leafs to win three titles in a row (page 28).

WHA: The first period belonged to New England, but after that it was all Winnipeg as the Jets defeated the Whalers 5-3 to win their second Avco Trophy in three years by sweeping the four-game final playoff series. By the end of the first period New England was ahead 2-0 on goals by Mike Antonovich and Rick Ley. In the second period the Jets picked up momentum, Dave Kryskow and Lyle Moffat scoring within 12 seconds to tie the game. Fourteen minutes later Anders Hedberg scored to put the Jets ahead to stay. In the third period Bobby Hull upped the count to 4-2, but New England's George Lyle closed it to 4-3 before the end of the period. With 32 seconds remaining in the final period, Hedberg scored on an empty-net goal to give the Jets their 11th victory in their last 12 meetings with New England. It was Hedberg's final game with the Jets before he and teammate Ulf Nilsson join the New York Rangers of the NHL.

HORSE RACING—TEMPEST QUEEN ($11.80), ridden by Jorge Velasquez, scored a 1¾-length win over Lakeville Miss in the $53,200 Acorn Stakes at Belmont.

LACROSSE—JOHNS HOPKINS upset defending champion Cornell 13-8 in New Brunswick, N.J. to win the NCAA championship (page 24).

MOTOR SPORTS—Driving a Lola-Chaparral Cosworth, AL UNSER won his third Indianapolis 500, finishing 8.3 seconds ahead of Tom Sneva in a Penske-Cosworth. Sneva also finished second last year (page 20).

Darrell Waltrip, driving a Chevrolet, won the $350,000 World 600 stock-car race in Charlotte, N.C. Donnie Allison finished second.

SOCCER—NASL: Chicago, which had been 0-10, got its first win, beating Detroit 2-1 on a pair of goals by Karl-Heintz Granitza. Tony Field, a former Cosmos forward, scored the only goal as lowly Memphis upset the Cosmos 1-0. Minnesota, winning for the seventh time this season, defeated Tampa Bay 3-2. The Rowdies traded their leading scorer, Derek Smethurst, to San Diego for Peter Anderson. Recently acquired Brian Budd scored a hat trick for Toronto in its 4-3 win over Dallas. The Metros also defeated Seattle 3-1 at home earlier in the week. Mike Flannigan, the second-highest scorer in the league, had two goals as New England beat San Jose 3-1. Houston, led by Kevin Welsh's hat trick, shut out Colorado 4-0.

ASL: Poli Garcia assisted on the first goal and scored the winner as California beat Sacramento 2-1. The Southern California Lazers beat the New York Eagles 2-0 for their second consecutive shutout. Steve Newman scored the only goal as the Indy Daredevils defeated the Los Angeles Skyhawks 1-0. The night before, the Skyhawks beat Cleveland 2-1.

TENNIS—Top-seeded BJORN BORG defeated Adriano Panatta 1-6, 6-3, 6-1, 4-6, 6-3 to win the $210,000 Italian Open in Rome.

Led by John McEnroe and Matt Mitchell, STANFORD won the NCAA team championship in Athens, Ga., defeating UCLA 6-3 in the finals. McEnroe, who made it to the semifinal round at Wimbledon last summer, and Mitchell won singles matches and then combined to win the doubles, to give Stanford its fourth championship in the last six years.

WTT: Sandy Mayer and Virginia Wade, whom New York traded to the Golden Gaters before the season, led their team to a 25-22 victory over the Apples, Mayer teaming with Frew McMillan in doubles to defeat Ray Ruffels and Fred Stolle 6-3 and winning the men's singles 6-3 over Ruffels. Wade took the women's singles, defeating JoAnne Russell 6-4. The next night, Martina Navratilova defeated the 1977 Wimbledon champion 6-4 as Boston scored its eighth victory in a row (one short of the team record); as the Lobsters won 31-18. On Friday, Wendy Turnbull beat Wade 7-5 as New Orleans defeated the Golden Gaters 23-22. New Orleans also snapped San Diego's 11-match winning streak with a 25-24 win in the Superdome before only 1,216 spectators. Filling in for Billie Jean King, who had bronchitis, Russell upset Navratilova 7-6 as New York beat Boston 31-22.

TRACK & FIELD—KATHY MILLS of Penn State set a women's world record of 15:35.5 in the 5,000, lowering Jan Merrill's record by 114 seconds, and set a meet record of 9:08.1 for the 3,000-meter run at the AIAW championships in Knoxville, Tenn. At the same meet, PATTY VAN WOLVELAERE of USC set an American women's record of 13.14 in the 100-meter hurdles, bettering the mark of 13.21 that she established three weeks ago. CALIFORNIA STATE-NORTHRIDGE set an American women's record of 8:33.51 in the 3,200-meter relay and also beat defending champion UCLA for the team title, 57-47.

The USC 800-meter relay team of JOEL ANDREWS (20.5), JAMES SANFORD (20.7), BILLY MULLINS (19.7) and CLANCY EDWARDS (19.4) ran a world-record 1:20.3 at the Sun Devil Relay Classic in Tempe, Ariz., breaking the previous mark of 1:21.4, held by Arizona State. The Tobias Striders won the event in 1:20.2, but because the team was composed of athletes of different nationalities, its time will not be recognized as a world record.

MILEPOSTS—PENALIZED: KANSAS STATE, by the Big Eight, for irregularities in its football program. The Wildcats will be barred from appearing on television in postseason, play, permitted to grant only 17 football scholarships in 1978, 26 in '79, and 27 in '80 (Kansas State had exceeded the limit of 30 per year in previous seasons), and will lose one-third of its share of the revenue earned by the conference from television, tournaments and postseason play. The penalties will cover a three-year period.

RESIGNED: As coach of the Philadelphia Flyers, FRED SHERO, 52, because, he says, he has lost his "effectiveness to motivate the team." Shero joined the Flyers as head coach in 1971. His teams had a 356-186-95 record, reached the playoffs six times and won the Stanley Cup twice ('74, '75).

RESIGNED: As manager of the Oakland A's, BOBBY WINKLES, 48. Winkles, the second of the team's last five managers to resign, was replaced by Coach Jack McKeon, 47, who was fired as manager by owner Charles Finley last June.