A Roundup Of The Week Aug. 28-sept. 2

BASKETBALL—The YOUNGSTOWN PRIDE won the World Basketball League championship, defeating Calgary 118-116 in the second game of a best-of-three series in Youngstown. Ohio. Eric Newsome sank a three-pointer with 55 seconds left to win it for the Pride. Youngstown's Barry Mitchell, a 6'4" forward who scored 29 points, was MVP for the game. David Henderson scored 29 for Calgary, and Perry Young scored 28.

BOXING—MAURICIO ACEVES of Mexico City retained his WBC lightweight title with a 10th-round knockout of Oscar Bejines of Guadalajara in a 12-round bout in Los Angeles.

HORSE RACING—TACTILE ($26.40), ridden by Richard Migliore. won the Gazelle Handicap, at Belmont, defeating Dream Deal by a nose after 1? miles. The 3-year-old filly finished in 1:48[2/5]. The victory was worth $67,440.

Angel Cordero Jr. won his 13th Saratoga riding title in 14 years when he rode STELLA MADRID ($6) to victory, defeating Golden Reef by 4� lengths in the six-furlong Spinaway Stakes. Cordero finished the meet with 34 victories, two ahead of Jose Santos. Stella Madrid, a 2-year-old filly, earned $141,800.

TENNIS—In singles play during the first week at the U.S. Open, in Flushing Meadow. N.Y., fourth-seeded Chris Evert became the first 100-match winner in the 108-year history of the championships, by beating Patricia Tarabini 6-2, 6-4 in the third round. Nine seeded players failed to make the round of 16. John McEnroe, the No. 4 seed, who has won the Open four times, lost a 6-4, 4-6, 6-3, 7-5 battle to Paul Haarhuis. Fifth-seeded Mats Wilander fell to Pete Sampras 5-7, 6-3. 1-6, 6-1, 6-4. Todd Witsken defeated No. 8 seed Brad Gilbert 4-6, 7-6, 4-6, 6-3, 6-2. Jim Grabb upset No. 12 seed Emilio Sanchez 4-6, 6-3, 7-6, 6-7, 6-4. Mikael Pernfors beat No. 16 seed Carl-Uwe Steeb 7-5, 4-6. 7-5, 6-4. In women's play. Larisa Savchenko upset No. 9 seed Pam Shriver 6-2, 6-3. Wendy White beat No. 10 seed Mary Joe Fernandez 6-4, 6-3. Rosalyn Fairbank defeated No. 14 seed Katerina Maleeva 6-4, 6-7, 6-3. and Donna Faber beat the No. 16 seed. liana Mandlikova. 6-3, 3-6, 6-1.

TRACK—Runners SAID AOUITA of Morocco and PAULA IVAN of Romania won the Grand Prix titles, each for the second straight year, at the season finale, in Monte Carlo. It was Aouita's third title in four seasons, and it was the first time any athlete has repeated. Galina Chistyakova of the Soviet Union finished four points behind Ivan in the women's standings, and hurdler Roger Kingdom of the U.S. trailed Aouita by six.

MILEPOSTS—DECIDED: By the International Olympic Committee, at its 95th session, in San Juan, that any athlete who competes in South Africa, which was banned from the Games in 1970 because of its apartheid policies, will be barred from participation in the Olympics. The committee voted to retain tennis as a medal sport on condition that the International Tennis Federation stop sponsoring tournaments in South Africa. In addition, it was ruled that soccer competition in the 1992 Games at Barcelona would be limited to players 23 and younger, and that demonstration sports would be dropped after '92. JUAN ANTONIO SAMARANCH. 69, of Spain, who has been president of the IOC since 1980, was reelected for four more years. HE ZHEN LIANG of China was elected a vice-president of the executive board, and ROBERT HELMICK of the United States was elected a member.

DROPPED: From the men's professional tour, by the Association of Tennis Professionals, which takes over the tour in 1990, tournaments in Capetown and Johannesburg, South Africa.

PLEADED GUILTY: In Cuyahoga County ( Ohio) Common Pleas Court, running back KEVIN MACK, 27, of the Cleveland Browns to one count of using cocaine. Mack faces up to 18 months in jail.

RULED: By arbitrator Thomas Roberts, that owners of major league baseball teams must pay $10,528,086.71 in damages for collusion to limit the free-agent market between the 1985 and 1986 seasons. The money, which represents salary losses, will be placed in an escrow account until it is divided among the 139 players affected. Roberts, who ruled on Sept. 21, 1987, that the owners had acted in concert, a violation of the league's labor agreement, said players also could submit claims to cover the loss of multiyear contracts, signing bonuses, bonus clauses and no-trade clauses. Baseball owners have the right to appeal the decision in court. The settlement is the first relating to three collusion cases. In a second case, covering the 1986-87 season, an arbitrator ruled in the players' favor and has yet to set damages. In the third case, for the '87-88 season, an initial ruling is pending.