A walk-off Home Run is always a great thing to witness, but a walk off Grand Slam is an out-of-this world event in baseball. This "Set 1" 3rd Base from April 7th, 2007, was signed by Alex Rodriguez after he slammed one of these rare game-ending four-run shots. With an inscription in black Sharpie reading "Alex Rodriguez Game Used Walk Off Grand Slam 4/7/07," this base is a memorial to this monster hit that won the Yankees the game that day. The base features Steiner and MLB holograms on its underside, along with "3rd base 4-7-07 Set 1" in Sharpie, and comes with a ticket stub from the game, as well as an LOA.