The Blue Jays have used a pretty motley crew at 3B this season: Edwin Encarnacion (initially, the regular, but his glove work was so bad, it lead people to believe "Encarnacion" must be Spanish for "throwing error.") and Jayson Nix. Nix quickly proved he could neither field nor hit, with a .169 BA, and OPS of .554.
Not quite panicking, RF Jose Bautista has been shifted to the hot corner.
Incredibly, it's NOT the worst in the league. Chone Figgins, before he was benched, put up a .186 BA, and .234 (!!!) slugging pct. He has an incredible OPS of .481.