July 3, 1966: Atlanta pitcher Tony Cloninger hits 2 grand slams vs. Giants

SF Giants' Madison Bumgarner and Buster Posey become first pitcher-catcher duo to each hit grand slam in single game – New York Daily News

MadBum in rare company with season's second slam

Stark: An ode to great (and not-so-great) moments of pitchers at the plate - The Athletic

2 grand slams in same inning? A rare feat in MLB

On This Date in Sports July 3, 1966: A Slamming Pitcher

This Day in Braves History: Chipper Jones has 5 hits against Cubs - Battery Power

1966 FILE : 1966 Boston Red Sox starting outfielders from L to R are Carl Yastrzemski, George Thomas and Tony Conigliaro at Fenway Park in Boston, Mass. (Photo by Cliff Welch/Icon Sportswire) (

List of Major League Baseball single-game grand slam leaders - Wikipedia

WHEN TOPPS HAD (BASE)BALLS!: February 2017

Tony Cloninger - Wikipedia

Pitchers can't hit? These 11 memorable moments say otherwise