 After spending 2013 with Professional Arena Soccer League team Milwaukee Wave, Walls returned to outdoor soccer when he signed for USL Pro club Rochester Rhinos on April 2, 2014.Following his first season with the Rhinos, Walls won the teams best defender award, as the Rhinos surrendered the 2nd fewest goals of any team.Walls signed with the USL Championship's Pittsburgh Riverhounds SC in January 2020.