BASKETBALL—NBA: Eastern runner-up BOSTON (39-12), on a nine-game winning streak, beat leader PHILADELPHIA (47-6) 118-106 to break the 76ers' own nine-game victory mark and cut their lead from 9� to 7 games. Later in the week the 76ers lost their first game to a Western Division club when the Hawks beat them 114-108. CINCINNATI (23-27) twice defeated NEW YORK (25-30) and edged into third place ahead of the Knicks, who lost four straight, as BALTIMORE (12-44) also dropped four in a row. SAN FRANCISCO (33-19) increased its lead in the West to 10 games with two wins and a loss, while second-place ST. LOUIS (23-29) split four. LOS ANGELES (21-31), with a 2-1 record, jumped to third, while CHICAGO (22-35) slipped to fourth and DETROIT (20-32) dropped into the cellar.
BOWLING—Left-hander DAVE DAVIS of Phoenix gained his second straight victory on the PBA tour when he outscored Jimmy Mack of Dover, N.J. 268-188 in the finals of the Denver Open.
BOXING—Middleweight Champion EMILE GRIFFITH retained his title with a unanimous decision over Joey Archer at New York's Madison Square Garden (page 44).
In a world featherweight championship bout in Mexico City, VICENTE SALDIVAR of Mexico retained his title as he scored a seventh-round TKO over Japan's Mitsunori Seki.
GOLF—ARNOLD PALMER won the $100,000 Los Angeles Open for the second straight year, defeating Gay Brewer Jr. by five strokes.
HARNESS RACING—At Vincennes race track near Paris, favored ROQUEPINE, the French trotter who won the United Nations Trot at Yonkers in October, took the $100,000 Prix d'Am�rique by one length over Oscar R. L.
HOCKEY—NHL: CHICAGO (26-11-6) won three in a row and moved nine points ahead of runner-up NEW YORK (21-16-7), which lost two of three games. Revitalized MONTREAL (19-18-5) jumped a point ahead of TORONTO (17-18-8) into third place with three victories and a loss as the slumping Maple Leafs extended their losing string to seven with three more defeats. Fading DETROIT (17-24-3) split two games, while last-place BOSTON (12-25-7) dropped two of three.
HORSE RACING—With prerace favorite Buckpasser out because of a hoof injury, H. B. Keck's DRIN ($7.60), ridden by Lafitt Pincay Jr., won the $129,800 Charles H. Strub Stakes at Santa Anita by a length over Quicken Tree (page 52).
MOTOR SPORTS—PARNELLI JONES, driving a Ford, won the rain-delayed Riverside ( Calif.) 500-mile race for stock cars.
SKIING—'I'm tired," said France's JEAN-CLAUDE KILLY after he lost the slalom in the Grand Prix de France at Meg�ve by less than half a second to hrs countryman Guy P�rillat, who totaled 2:01.32 to Killy's 2:01.79 in the two runs. Earlier in the meet Killy look the downhill by two seconds over Peter Rohr of Switzerland.