| Peter Hetherington defeated Mark Showalter |
2012 U.S.Open 9-Ball |
| Mark Showalter defeated Eddie Cirasella |
2012 U.S.Open 9-Ball |
| Warren Kiamco defeated Mark Showalter |
2012 U.S.Open 9-Ball |
| Mark Showalter defeated Warren Kiamco |
2019 U.S.Open 9-Ball |
| Jui-An Hsu defeated Mark Showalter |
2019 U.S.Open 9-Ball |
| Bradley Shearer defeated Mark Showalter |
2019 U.S.Open 9-Ball |
| Mark Showalter defeated Tracy Cantrell |
2023 Derby City Classic Bank Pool |
| Mark Showalter defeated Tony Flannery |
2023 Derby City Classic Bank Pool |
| Kim Dyer defeated Mark Showalter |
2023 Derby City Classic Bank Pool |
| Mark Showalter defeated John Braud |
2023 Derby City Classic 9-Ball |
| Joe Johnson defeated Mark Showalter |
2023 Derby City Classic 9-Ball |
| Mason Stewart defeated Mark Showalter |
2024 Derby City Classic One Pocket |