A roundup of the week April 8-14

PRO BASKETBALL—NBA: Detroit's Isiah Thomas made 21 assists in a 102-96 victory over Washington to bring his season total to 1,110 and break the NBA record of 1,099 set by Kevin Porter of the Pistons in 1978-79. Thomas had 13 more assists in the Pistons' final regular-season game, a 116-113 win over Cleveland, and so goes into the books with a total of 1,123. Eastern Division champion Boston, which faces Cleveland in the first round of the playoffs, closed with a 129-118 loss to New Jersey, which meets Detroit. Milwaukee, the Central winner, finished by handing New York its 12th straight loss (88-84) to leave the Knicks with a 24-58 record, their worst since 1964. The Bucks open the playoffs at Chicago. Washington is paired with Philadelphia. In the Western Conference the matchups are Denver (page 58) vs. San Antonio, Los Angeles vs. Phoenix, Portland vs. Dallas and Houston vs. Utah.

CBA: The Tampa Bay Thrillers won the league title with a 109-105 victory over the Detroit Spirits in the seventh game of the championship series.

BOWLING—MARK WILLIAMS beat John Kirker Jr. 245-185 to win the $150,000 Pat Boone Open in Windsor Locks, Conn.

BOXING—MARVELOUS MARVIN HAGLER defeated Thomas Hearns to retain his world middleweight title in Las Vegas (page 20).

Soon-Chung Kwon of Korea KO'd Japan's Shinobu Kawashima in the third round in Pohang, South Korea to retain his IBF flyweight crown.

PRO FOOTBALL—USFL: After losing to Denver 28-7 on Monday night. Arizona was upset by Orlando 24-19. Jacksonville beat San Antonio 28-17 behind Larry Mason's 100 yards rushing, while Herschel Walker rushed for 109 to lead New Jersey over Portland 34-7. Birmingham defeated Oakland 20-17 while Memphis edged Baltimore 13-10 on Alan Duncan's-35-yard field goal in OT, and Frank Seurer made a 35-yard TD pass to Jojo Townsell with 1:08 left to lift Los Angeles over Houston 18-17.

GOLF—BERNHARD LANGER shot a six-under-par 282 to win the 49th Masters in Augusta (page 26).

Beth Daniel beat Pat Meyers by two strokes to win a $175,000 LPGA event in San Diego, carding a two-under-par 286.

GYMNASTICS—OHIO STATE won the NCAA Division I men's championship in Lincoln, edging Nebraska 285.35 points to 284.55. The Cornhuskers' WES SUTER won the individual all-around title with a score of 58.20.

At the NCAA women's championships in Salt Lake City, the UNIVERSITY OF UTAH defeated Arizona State 188.35-186.60 to win its fifth consecutive team title. Alabama's PENNEY HUSCHILD scored 37.95 points to take the all-around title.

PRO HOCKEY—Minnesota awakened in the first round of the playoffs to sweep St. Louis 3-2, 4-3 and 2-0 as goalie Gilles Melodic turned away 39, 41 and 27 shots in the three games. The North Stars' next opponent is Chicago, which outscored Detroit 23-8 (9-5, 6-1 and 8-2) to sweep their series. Philadelphia swept the Rangers by scores of 5-4 in overtime, 3-1 and 6-5 in a series marred by a bench-clearing brawl in the second game that earned each team a $5,000 fine. The Flyers will next face either Washington or the Islanders, who were tied 2-2 at week's end in a series costly for the Islanders and their coach, Al Arbour. The Capitals won the opener 4-3 in overtime, then took Game 2 on a goal by Mike Gartner at 1:23 in the second OT. Arbour felt that his goalie, Kelly Hrudey, had been interfered with on the play. Arbour shoved one official and he and his team made disparaging remarks about the officiating, which brought the club and Arbour fines of $7,500 apiece. The Islanders stayed alive with 2-1 and 6-4 victories at home, the latter featuring a four-goal rally in the third period and a Billy Smith save on Bobby Carpenter's penalty shot with 30 seconds to play and New York ahead 5-4. After beating Los Angeles 3-2 in overtime and 4-2, Edmonton got a goal from Glenn Anderson 46 seconds into OT to eliminate the Kings with a 4-3 victory. Winnipeg won its series with Calgary, while Boston, which hadn't won a playoff series (0-15) from Montreal since 1943, drew even with the Canadiens at two games apiece with a 7-6 victory on Sunday night, rallying from a three-point deficit. Buffalo and Quebec were also tied at 2-2, each team winning twice on its home ice.

HORSE RACING—RASCAL LASS ($11), ridden by Ray Sibille, beat Denver Express by 1½ lengths to win the $282,700 Fantasy Stakes for 3-year-old fillies at Oaklawn Park. The winner's time was 1:43[1/5] for the 1[1/16] miles.

Greinton ($3.60), Laffit Pincay up, edged Precisionist by a neck to win the $257,300 San Bernardino Handicap at Santa Anita. The 4-year-old colt ran the 1‚⅛ miles in 1:47 flat.

INDOOR SOCCER—On the last day of the MISL regular season, Eastern Division-winner Baltimore lost to Cleveland 4-3. San Diego, the No. 1 team in the West, beat Las Vegas 10-7 on four goals by Branko Segota and two by Steve Zungul, who won his third MISL triple crown, leading the league in goals (68), assists (68) and points (136).

MARATHON—GEOFF SMITH won the 89th Boston Marathon with a time of 2:14:05. LISA LARSEN WEIDENBACH was first among the women, finishing in 2:34:06 (page 77).

Salah Ahmed of Djibouti ran a 2:08:09 to win the World Cup Marathon in Hiroshima, Japan, beating Takeyuki Nakayama of Japan by six seconds and missing Steve Jones's world record by only four. In the women's race, KATRIN DÖRRE of East Germany clocked a 2:33:30 to defeat Zoia Ivanova of the Soviet Union by 47 seconds.

MOTOR SPORTS—MARK) ANDRETTI, in a Lola, won the Long Beach (Calif.) Grand Prix, finishing 60.1 seconds ahead of Emerson Fittipaldi in a March (page 70).

Bill Elliott drove his lord to victory in the $338,350 TranSouth 500, averaging 126.295 in a light rain on the 1.366-mile Darlington (S.C.) International Raceway oval. He finished 1.86 seconds ahead of Darrell Waltrip, who drove a Chevy.

TENNIS—IVAN LENDL defeated Tim Mayotte 7-6, 6-4, 6-1 to win a $500,000 WCT tournament in Dallas.

Chris Evert Lloyd defeated 14-year-old Gabriela Sabatini of Argentina 6-4, 6-0 in the finals of a $200,000 tournament in Hilton Head Island, S.C.

MILEPOSTS—HIRED: As basketball coaches: at Arkansas, NOLAN RICHARDSON, 43, who went 119-37 in his five years as coach at Tulsa; at Oral Roberts, TED OWENS, 55, the former coach at Kansas (1964-83); at California, LOU CAMPANELLI, 46, who was formerly at James Madison.

REVERSED: By the Florida Division of Pari-Mutuel Wagering, the disqualification of Chiefs Crown in the March 30 Flamingo Stakes that had resulted in the awarding of first place to Proud Truth. The official winner is now Chief's Crown, with Proud Truth in second.