Getty Images Mike Piazza

Ten days ago, we mourned the tragedy of Sept. 11, 2001, on its 15th anniversary.

So naturally, on Sept. 21, 2016, we celebrate the 15th anniversary of a joyful event that gave New Yorkers and baseball fans across the globe a little extra hope: Mike Piazza's go-ahead home run in the first sporting event in New York City after 9/11.

The Mets entered the night 74-73, five and a half games back of the NL East-leading and visiting Braves. Bobby Valentine's team, donning hats acknowledging FDNY, NYPD and other first responders, trailed Atlanta 2-1 in the bottom of the eighth inning when Piazza came up with a runner on first and one out. The catcher belted a moonshot over the center field fence, giving the Mets a 3-2 lead, which Armando Benitez closed out in the ninth.

"I remember looking up and praying to God, saying, 'Lord, please give me the strength to get through this, because I don’t know if I can,'" Piazza said in a recent MLB Network Presents documentary. "It's amazing, when you're in the right place and the right time, and you believe in yourself and you have a lot of people pulling for you, and you feel it… It was just this incredible release of emotion, and I think it became evidently clear that people just wanted to cheer -- cheer about something.

"I've got to be honest with you, I truly feel uncomfortable when people say, 'You’re a hero -- that home run.' I have disavow myself of it. I don’t feel like a hero. I really don’t."

Piazza, who entered the Hall of Fame this past summer, finished his career with 427 home runs (his 396 as a catcher are a record for the position), but no other dinger had the drama of that fall 2011 blast.

-- Follow Jeffrey Eisenband on Twitter @JeffEisenband.