He was also a member of the Carolina Panthers, Philadelphia Eagles, and New England Patriots but did not appear in any games for any of those teams.
With the Marshall Thundering Herd, Mercer was part of the 1996 NCAA Division I-AA national championship team as a freshman.
In 1998, Mercer had 96 tackles including 16 for loss and four sacks, for which he earned first-team All-Mid-American Conference honors.
[3] Mercer signed with the Carolina Panthers as an undrafted free agent in April 2000 following the 2000 NFL draft but was released in June.
[4] After suffering an injury during a preseason game, Mercer spent the 2000 season on injured reserve.