Federal agents raided the laboratory and home of an Illinois chemist who authorities believe created one of the steroids at the heart of the BALCO sports doping scandal, the San Francisco Chronicle reported yesterday.

Investigators with the Internal Revenue Service's criminal investigation division and the U.S. Food and Drug Administration searched Thursday in Champaign, Ill., at the home and laboratory of chemist Patrick Arnold, the newspaper reported, citing sources who wished not to be identified.

BALCO founder Victor Conte and Vice President James Valente identified Arnold as the source of a once-undetectable steroid called "the clear." Conte, Valente, track coach Remi Korchemny and Greg Anderson -- the longtime friend and personal trainer of Giants slugger Barry Bonds -- pleaded guilty to distributing steroids and will be sentenced next month.

Two sources with knowledge of the latest raids also told the Chronicle that the San Francisco grand jury is still hearing testimony in the BALCO case, suggesting the possibility of more indictments to come despite the four plea agreements.

* GOLF: Michelle Wie will stick to her routine by going to school Wednesday, with one notable exception. She will be the only junior at Punahou School who already is a millionaire.

Six days before she turns 16, the 6-foot prodigy will turn professional with two endorsement deals that will make her the richest female golfer. Two sources involved with her decision, speaking on condition of anonymity, said Wie will make the announcement at 8 a.m. Wednesday -- before school starts -- in Honolulu. The sources said Wie will sign endorsement deals with Nike and Sony. . . .

John Huston continued his solid play of late, posting a second consecutive 6-under 66 to take the second-round lead at the Chrysler Classic of Greensboro in North Carolina. Huston is at 12-under 132, one shot better than K.J. Choi (69). . . .

Colin Montgomerie shot a 7-under-par 65 in strong wind to take the lead after the second round of the Dunhill Links Championship on the Old Course in St. Andrews, Scotland. Montgomerie was at 135, a stroke ahead of Kenneth Ferrie.

* TENNIS: Lleyton Hewitt withdrew because of a groin injury and Robby Ginepri lost in the quarterfinals, eliminating the second- and third-seeded players from the Thailand Open in Bangkok.

Top-seeded Roger Federer, the defending champion, had no trouble reaching the semifinals with a 6-4, 6-3 win over Gilles Muller of Luxembourg. The Swiss star will face sixth-seeded Jarkko Nieminen.

-- From News Services