BASKETBALL—NBA: The Boston Celtics took a 2-0 lead over Cleveland in their best-of-seven semifinal series by downing the Cavaliers twice at Boston, 111-99 and 94-89. John Havlicek and Jo Jo White shared high-scoring honors, with Havlicek getting 26 points in the first game and White 24 in the second. Cleveland Center Jim Chones suffered a broken toe in a preseries practice and missed both games, but old hand Nate Thurmond limited Boston's Dave Cowens to 29 points and 24 rebounds. The NBA coaches voted Boston Forward Paul Silas the best all-round defensive player in the league and put three Celtics on the All-Defense team: Silas, Cowens and Havlicek. Phoenix evened its semifinal with Golden State at two games apiece with a 133-129 double overtime win on Sunday. Earlier in the week the Suns and the Warriors split road-game triumphs, Phoenix thwarting the Warriors 108-101 despite Rick Barry's 44 points and Golden State handing the Suns their first loss in 16 home games 99-91 before a crowd of 13,306 people, the largest in Phoenix history. Keith Erickson's 20-foot basket with two seconds to play sent Sunday's game into overtime, and Ricky Sobers' two free throws with two seconds left forced the second overtime. Erickson's four long-range baskets clinched the game for the Suns.
ABA: With The Doctor performing major surgery, the New York Nets beat the Denver Nuggets 117-111 and 121-112 at home to take a 3-1 lead in their best-of-seven championship series (page 26).
BOXING—CARLOS ZARATE of Mexico City won the WBC bantamweight championship on a ninth-round knockout of fellow Mexican Rodolfo Martinez in Los Angeles. It was Zarate's 41st consecutive victory and his 40th knockout.
In San Juan ESTEBAN DEJESUS captured the WBC lightweight championship with a unanimous decision over Guts Ishimatsu of Japan.
BRIDGE—The U.S. team of BILL EISENBERG, FRED HAMILTON, IRA RUBIN, PAUL SOLO-WAY, ERIK PAULSEN and HUGH ROSS won the world team championship, defeating the Italian Blue team 232-198, at Monte Carlo.
GOLF—MARK HAYES, 26, won his first PGA tournament, the Byron Nelson Classic, shooting an 11-under-par 273 in Dallas to beat Don Bies by two strokes and win $40,000.
South Africa's SALLY LITTLE holed out an 80-foot sand shot from a trap at the 18th green for a birdie to beat Australia's Jan Stephenson by one stroke in the $70,000 Women's International tournament at Hilton Head Island, S.C. Little shot a seven-under 281 (page 73.)
HOCKEY—NHL: Montreal and Philadelphia, the league's two best teams during the regular season, gained the Stanley Cup finals by eliminating the New York Islanders and the Boston Bruins, respectively, in five games. The Canadiens then won the best-of-seven championship opener 4-3 Sunday night in Montreal on Guy Lapointe's goal with just 82 seconds to play (page 22).
WHA: New England took a 2-1 lead in its best-of-seven semifinal with Houston by beating the Aeros 4-2 and 4-1 while losing the middle game 5-2. Off the ice, Toronto's Mark Napier was named Rookie of the Year, Cleveland Captain Paul Shmyr the best defenseman and Toronto Center Vaclav Nedomansky the most gentlemanly player. Toronto Owner John Bassett decided to move or sell the franchise after suffering losses of some $4 million in the last three years.
MOTOR SPORTS—BRIAN REDMAN of England beat Danny Ongais by 6.117 seconds to win the first race of the Formula 5000 season at the Pocono (Pa.) International Raceway, completing the 35 laps of the 2.8-mile oval at an average speed of 123.437 mph.