PRO BASKETBALL—As the NBA best-of-seven conference finals got under way on Sunday, the Boston Celtics crushed Philadelphia 121-81 and the Los Angeles Lakers overpowered San Antonio 128-117. Earlier in the week, the Celtics squeaked by Washington 133-126 in double overtime to eliminate the Bullets in five games, thanks in part to 33 points from Robert Parish and a slump-breaking 26 from Larry Bird, who had been held to 60 points in games 1 through 4. Philadelphia polished off Milwaukee in six games, winning the finale 102-90 as Maurice Cheeks scored 26 points. In the West, San Antonio's two-gun attack—George Gervin (26 points) and Mike Mitchell (24)—led the Spurs to a series-clinching 109-103 triumph in the fifth and decisive game of their quarterfinal matchup versus Seattle. For the series, Gervin had 136 points and Mitchell 120.
BOXING—RAY (Boom Boom) MANCINI knocked out Arturo Frias in Round 1 to win the WBA lightweight championship at Las Vegas (page 30).
Salvador Sanchez retained his WBC featherweight championship with a unanimous decision over Jorge (Rocky) Garcia in Dallas (page 32).
GOLF—ED SNEED's birdie putt on the first hole of sudden death beat Bob Shearer in the $350,000 Houston Open. They both shot nine-under-par 275s in regulation.
HARNESS RACING—BEATCHA ($5.20), driven by John Campbell, won the first leg of the $375,000 World Cup Pacing Series by 3� lengths over Genghis Khan at the Meadowlands. The 4-year-old colt was timed in 2:09[1/5] for the 1? miles.
HOCKEY—The New York Islanders, who opened their best-of-seven Stanley Cup championship series against Vancouver with a 6-5 victory in overtime, earlier had advanced to the finals by completing a sweep in the semis of the Quebec Nordiques with a 4-2 victory. Vancouver had qualified for the title round by eliminating Chicago (page 34).
HORSE RACING—ROBSPHERE ($5), Jorge Velasquez up, beat Present the Colors by 1� lengths to win the $118,400 Dixie Handicap at Pimlico. The 5-year-old gelding ran the 1� miles in 2:30[1/5].
MARATHON—JOYCE SMITH, a 44-year-old housewife, won the women's division of the London Marathon for a second consecutive year, running the distance in 2:29.43. HUGH JONES won the race, which drew a field of 16,350, in 2:09.24.
MOTOR SPORTS—JOHN WATSON, driving a McLaren, gained the lead in the penultimate lap and beat Keke Rosberg, in a Williams, at the Belgian Grand Prix in Zolder. Watson averaged 116.19 mph over 70 laps on the 2.65-mile circuit.
INDOOR SOCCER—After eliminating Buffalo by a 10-6 score in a decisive third game of the MISL quarterfinals, defending champion New York swept its best-of-three semis against Baltimore 6-5 and 6-2. In the opener, Paul Kitson's goal at 10:19 of OT barely rolled past the goal line behind Blast Net-minder Keith Van Eron. So close was the call that afterward several Baltimore players chased after Goal Judge Joe Morda, who was escorted out of New York's Nassau Coliseum by security police. Arrow Forward Steve Zungul, who booted four goals in the clincher against Buffalo, had four more in the series clincher at Baltimore. In Game 1 of the Western Division semis, St. Louis scored six straight fourth-quarter goals to steamroll Wichita 10-5. But the Wings bounced back, overcoming a 5-1 deficit to beat St. Louis 7-6 in OT and even the series.