NEW YORK -- Mike Tyson will fight outside the United States for the third time in four bouts when he takes on Denmark's Brian Nielsen at Copenhagen on Sept. 8.

The 35-year-old former undisputed heavyweight champion's first match in almost 11 months was announced formally Monday by Showtime, which will show the fight on same-day tape delay beginning at 9 p.m ET.

The official announcement of the 10-round bout was delayed while the San Bernardino, Calif., district attorney's office looked into a woman's claim that Tyson raped her. Prosecutors decided Friday not to file charges.

The fight against Nielsen (62-1, 43 knockouts) will be the first this year for Tyson, who had three brief bouts in 2000.

He stopped Julius Francis in the second round at Manchester, England, in January, stopped Lou Savarese in 38 seconds at Glasgow, Scotland, in June, and won when Andrew Golota quit after the second round Oct. 20 at Auburn Hills, Mich.

Nielsen's best-known opponents have been Larry Holmes and Tim Witherspoon, both former heavyweight champions.

He scored a 12-round decision over Holmes in 1997 when Holmes was 47. He knocked out Witherspoon in the fourth round in 1999 when Witherspoon was 42.

Nielsen's loss came when he was stopped in the 10th round by Dick Ryan in 1999.