MLB's first extra-innings game produced a walkoff grand slam

A walk-off grand slam is one of baseball's purest moments - let's not lose it

Jose Altuve hits walk off grand slam in extra innings

July 17, 2018: American League wins home run-happy All-Star Game in extra innings – Society for American Baseball Research

Padres slam their way into MLB record books - The San Diego Union-Tribune

Jacob Stallings: Pirates catcher hits walk-off grand slam to beat Mets - Sports Illustrated

And That Happened: Wednesday's scores and highlights - NBC Sports

Longest Playoff Games in MLB History

Extra Inning Tiebreaker Rule Invoked for 1st Time in MLB (7/24/20)

Pete Alonso hits grand slam in Mets walk-off win vs. Guardians

Dodgers beat Phillies on Max Muncy's walk-off grand slam - Los Angeles Times

Matt Olson grand slam wins 1st new-rule extra-inning game

A's slam Angels in 1st MLB game with new extra-inning rule

Angels, A's make MLB history by being first to play under 2020 rule for extra innings

John Hicks walkoff grand slam

A's beat Angels on walk-off grand slam - Yahoo Sports