MLB player Mark Reynolds throws right.
MLB player Mark Reynolds bats right.
MLB player Matt Reynolds throws left.
MLB player Mark Ellis throws right.
MLB player Mark Lowe throws right.
MLB player Mark Melancon throws right.
MLB player Mark Teixeira throws right.
MLB player Mark Trumbo throws right.
MLB player Matt Reynolds bats left.
Left.
He is left handed
For right handed people they do catch with their left and throw with their right. For left handed people, they catch with their right and throw with their left. Both players have to potential to bat from either side of the plate.
This riddle refers to a boomerang. When you throw a boomerang to the right, it travels in an arc and returns to your left side, allowing you to see it again. However, if you throw it to the left, it continues on its path and does not return, so you won't see it again.