MADISON, Wis. — Former major league pitcher Jerry Koosman has pleaded guilty to federal tax evasion and could face up to one year in prison.

Koosman entered the plea Friday in Madison. He will be sentenced July 21.

He was charged in April with failing to file an income tax return before April 15, 2003. A message left at his home in Osceola was not returned Friday afternoon.

Koosman's attorney, Robert Bernhoft, didn't immediately return a message left at his office.

Koosman, a left-hander, pitched for the New York Mets and won two games in the 1969 World Series. He also pitched for the Minnesota Twins, the Chicago White Sox and the Philadelphia Phillies.

He retired in 1985 with 222 wins.