Hawpe, a former All-Star with eight years of MLB experience, last appeared in the big leagues with the 2011 Padres. He spent the 2012 season with Texas' Double-A affiliate, posting a .260/.382/.382 batting line in 152 plate appearances. The 33-year-old left-handed hitter reached the 20-homer plateau four consecutive times with the Rockies from 2006-09.
May, who appeared in 12 games with the 2010 Royals, spent this past season with the Mets' top affiliate. The 28-year-old posted a .215/.245/.348 batting line in 269 plate appearances at Triple-A Buffalo.