September 21, 2001: Piazza homer leads Mets in New York City's first baseball game after 9/11 – Society for American Baseball Research
Mike Piazza, Mets honor victims of Sept. 11 attacks
24 Mike Piazza September 21 2001 Stock Photos, High-Res Pictures, and Images - Getty Images
Mike Piazza, Mets honor victims of Sept. 11 attacks
Mets, Yankees and more pay tribute on 9/11 20th anniversary
Mets, Yankees, sports teams pay tribute on 9/11 20th anniversary
Mets Honor 9/11 Responders - WSJ
The Mets will #WearTheCaps - The Mets Police
17 years ago today: Mike Piazza's homer in first game in New York after 9/11 attacks
Mike Piazza, Mets honor victims of Sept. 11 attacks
Baseball Hall of Famer Mike Piazza's greatest moments as a Met –
Mike Piazza's post-9/11 home run remains memorable to New York City 20 years later
Heartbreak and hope: Members of 2001 Mets reflect on their role in helping NYC recover from 9/11