When Buster Posey went down, many Giants fans hung their heads in a collective, preemptive sign that the season was, in many ways, over.
Without Posey, it seemed unlikely that the Giants would make another run at the postseason. The San Francisco farm system wasn't exactly bursting at the seams with young offensive prospects ready to fill Posey's shoes (which rumor has it are made of solid gold and can cure disease simply through touch).
But then there was Brandon Crawford. No one was expecting much (well, anything really) out of Crawford when he stepped to the plate against the Brewers and hit a grand slam in his very first major league game. But once he did, there was a spark of hope within Giants nation. It was as if a replacement player with low career numbers in the minors had suddenly changed the outlook of the 2011 season.
But Crawford wasn't alone in his impressive Giants debut. Many before him have put on the black and orange and exceeded all expectations.
Here are some of the most impressive debuts in Giants history, courtesy of Brandon Crawford's heroics.