5. Nelson Velazquez's grand slam
This entry is one of those moments that makes me happy to be a fan of baseball in general. You never know what you're gonna get when you go to the ballpark, and Wrigley Field is one of the best environments for unbelievable moments.
Hayden Wesneski took the mound for Chicago and almost immediately put them in the hole. By the second inning, the Seattle Mariners had poured on 7 runs and it looked like a pretty awful time to be a Cubs fan.
But the Cubs came storming back and retook the lead after rookie outfielder Nelson Velazquez cranked a go-ahead grand slam. I was at the park for this game, and I surely wasn't expecting to get postseason-like atmosphere in the third inning of an interleague contest against the Mariners in the second week of the season. But I'm not lying when I say that Wrigley Field was deafening when Velazquez hit that ball.