Last year was arguably Whitesell's best season in the Nationals' organization. He hit .284 with a career-high 21 home runs and a .425 on-base percentage for Double-A Harrisburg.
Going into that season, Whitesell, 25, had a reputation of being a mediocre first baseman, but he cut down on his errors and was named the Eastern League's best defensive first baseman in a survey conducted by Baseball America.
Whitesell was the Expos' sixth-round pick in the 2003 First-Year Player Draft.
Bill Ladson is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.