Sekorski made his professional debut on January 21, 1981, with a four-round decision win against Rick Kellar.
He won his first 13 professional matches, losing for the first time to 41-5-2 Marvin Camel on May 21, 1983, in Billings, Montana.
Sekorski won three more times before his next loss, to 11-1 Pierre Coetzer in Johannesburg, South Africa.
Sekorski continued to fight boxers of a high calibre, his biggest win being a sixth-round TKO of former world champion Leon Spinks in Detroit Lakes, Minnesota on August 2, 1986.
Thereafter Sekorski would lose more than he won, concluding his career with a loss to Jimmy Lee Smith on November 22, 1993.