Walker gives the Revs one of the top base-stealing threats in the Atlantic League, bringing 372 stolen bases to York over a nine-year pro career. He has played in the Atlantic League with the Camden Riversharks for parts of the last three years, and has ranked second in the league in steals the last two seasons, swiping 61 bags in 2009, and 55 more in 2010 while also hitting .281. In 2008, Walker began the year in Camden before his contract was purchased by the Los Angeles Angels of Anaheim one month into the season. He spent the remainder of that year at Triple-A Salt Lake.

The 30-year-old Walker was originally a sixth round draft pick of the Chicago Cubs in 2002 out of Georgia Southern University. The Greenwood, MS native led his league in stolen bases in three consecutive seasons, totaling 60 steals with Lansing in 2004 and Daytona in 2005, and 50 more with West Tennessee in 2006. Walker first reached the Triple-A level with the Iowa Cubs in 2007.