Mitch Keller has received a $1 million signing bonus from the Pittsburgh Pirates, according to baseball writer Jim Callis of MLB.com and other published reports.

Keller, 18, was selected in the second round of the 2014 draft by the Pirates with the 64th overall pick.

The "slotted" bonus money for the No.64 pick, established by Major League Baseball, is $886,800. That means the Pirates gave Keller an extra $113,200 to reach $1 million.

Keller said Tuesday he would be getting more than the recommended slot money, but declined to reveal the specific amount.

Keller, from Cedar Rapids, graduated from Xavier High School this spring. He has been assigned to Pittsburgh's rookie team in the Gulf Coast League in Florida. The season starts June 20.