BRIEFLY : 49ERS' STADIUM PLAN FACES MORE TROUBLE.

Byline: Daily News Wire Services

Denise DeBartolo York has effectively shut down the company that her brother, San Francisco 49ers owner Eddie DeBartolo, said would develop the mall and new stadium for the team, the San Francisco Examiner reported.

DeBartolo Entertainment, LLC of San Mateo, set up in 1995 to pursue gambling and entertainment ventures, fired about a dozen of its 15 employees on Friday, said the newspaper.

The move apparently indicates DeBartolo York and the board of the DeBartolo company, rather than Eddie DeBartolo, are in control of the stadium project.

The list of people who lost their jobs included former 49ers linebacker Keena Turner, who had been an ambassador for the entertainment company in Hunters Point, a low-income area where the project was expected to have the largest impact.

The 49ers reached agreement with quarterback Ty Detmer, who started 18 games the past two seasons with Philadelphia. Detmer, who chose the 49ers over Atlanta, is expected to serve as the team's third-string quarterback.

TRACK AND FIELD: World 100-meter champion Maurice Greene kept up his assault on Donovan Bailey's world record in Sydney, Australia, becoming the first person to break the 10-second barrier on Australian soil. Greene clocked 9.99 seconds into a slight head wind to easily beat the 10.06 he ran in the Grand Prix meeting in Melbourne on Wednesday. Bailey, whose world record is 9.84, missed the meet with a bruised heel after coming in third to Greene in Melbourne.

Tisha Waller, a 27-year-old Atlanta grade-school teacher, set an American women's indoor record of 6 feet, 7 inches, in the high jump at the USA Championships in Atlanta's Georgia Dome. She broke the 16-year-old record of 6-6-3/4, held by Coleen Sommer.

BASEBALL: The only Venezuelan to play in America's Negro baseball leagues died three weeks after his collapse on a grimy sidewalk reminded a nation he once was a star first baseman. Carlos Ascanio, 82, who played three months with the New York Black Yankees in 1946, died Friday of respiratory failure in Caracas, Venezuela. Ascanio and his wife had been living in a rundown boarding house, selling batteries and cassettes on the street.

On Feb. 9, his body gave out. Two people found him on the sidewalk. He was diagnosed with severe anemia caused by years of malnutrition.

TENNIS: Pete Sampras recovered from an 0-3 start to beat Tommy Haas 6-4, 6-4 and move into the Advanta Championships final in Philadelphia.

Today, Sampras will face third-seeded Thomas Enqvist, who beat Sebastian Lareau of Canada 6-3, 3-6, 6-3.

Venus Williams beat top-seeded Lindsay Davenport for the first time in four tries, overcoming a slow start to win 6-7 (5-7), 6-2, 6-3 and reach the final of the IGA Tennis Classic in Oklahoma City.

BOXING: WBC lightweight champion Steve Johnston ran his record to 24-0, defending his title with a unanimous 12-round decision over George Scott in Atlantic City, N.J. Johnston rebounded from a sluggish first round and battered Scott, knocking him down for the first time in Scott's career.