Curtis was sentenced by Barry County Circuit Judge Amy McDowell, who called the two-time World Series champion a "predator."
But Curtis, who this summer was found guilty of six counts of criminal sexual conduct, told McDowell that the three victims lied. He described himself as a Christian servant, and said he and one of the victims "could write a book together someday, and it could have a positive impact on a lot of people."
According to prosecutors, Curtis, 44, sexually assaulted the girls last year when he was a volunteer weight-room strength trainer at a high school in Barry County. A 16-year-old girl said he touched and kissed her breasts. Two 15-year-old girls said Curtis inappropriately touched their buttocks.
"You certainly are a threat to any community you get into," McDowell told Curtis.
One of the girls spoke during the sentencing hearing, saying Curtis was a manipulator who knew what he had done.
Curtis played for the then-California Angels, Detroit Tigers, Los Angeles Dodgers, Cleveland Indians, New York Yankees and Texas Rangers from 1992 to 2001. He won the two World Series rings with the Yankees.