Two Grand Slams, One Inning, Same Pitcher: The Most Unbelievable Night in Baseball History

In the grand history of sports records, most milestones are built on a bedrock of relentless discipline, superhuman genetics, and decades of sacrifice. Think of long-distance running records or career home run totals. They take thousands of hours of grinding.

And then, there is April 23, 1999.

On that spring night, St. Louis Cardinals third baseman Fernando Tatis Sr. stepped up to the plate and accomplished something so wildly improbable, so utterly bonkers, that it stands alone in the 150-plus year history of Major League Baseball. He hit two grand slams in a single inning. Off the exact same pitcher.

To understand why this is the sporting equivalent of getting struck by lightning while winning the lottery, you have to break down the sheer comedic chain of events required to even attempt it.

The Mathematical Chaos of the Bases Loaded

First, consider what has to happen for a player to hit just one grand slam. You need three of your teammates to get on base ahead of you. That’s tricky enough against world-class pitching.

To hit two grand slams in the same inning, your team’s offense has to completely explode. You hit your first home run, clear the bases, and sit down in the dugout. Then, eight of your teammates have to come to the plate. At least three of them need to get on base all over again without the inning ending. Only then do you get to walk back up to the plate with the bases loaded a second time.

It requires a perfect cocktail of offensive firepower, wild luck, and a baseball universe aligned in absolute chaos.

The Man on the Mound

This brings us to Los Angeles Dodgers pitcher Chan Ho Park, a genuinely talented pitcher who unfortunately found himself on the wrong side of baseball destiny that night.

In the third inning, Tatis crushed his first grand slam of the night, clearing the bases and giving the Cardinals a massive surge. Ordinarily, when an inning starts spiraling like that, managers scurry to the bullpen to save their starter from further punishment. But for a variety of game-management reasons, Park was left out on the mound to work through the jam.

Eight batters later, the bases were full again. And walking out of the dugout, bat in hand, was Fernando Tatis.

Imagine standing on the pitcher’s mound, looking up, and seeing the exact same guy who just launched your baseball into orbit ten minutes ago, except now all the bases are full again. Park threw, Tatis swung, and lightning struck twice. Eight runs driven in by one human being in a single inning, all off one pitcher.

The Otterly Interesting Part

What makes this record so beautifully secure isn't just that hitting two grand slams is hard. It’s that modern baseball management has made it virtually extinct. In today's game, the second a pitcher lets the bases load up twice in a single inning after already giving up a grand slam, they are pulled from the game faster than a cat knocking a glass off a table. Chan Ho Park’s presence on the mound for both slams was a rare moment unlikely to ever be repeated. He and Tatis are forever bonded in baseball lore—one as the ultimate hero of the inning, and the other as an unforgettable part of sports trivia.

A Record Out of Reach

To break this record, a batter would need to hit three grand slams in one inning. That would require 12 total runs from three swings of the bat by one person in about twenty minutes. Is it technically possible? In the quantum realm, maybe. In reality? Not a chance.

So here’s to Fernando Tatis Sr., Chan Ho Park, and April 23, 1999—the night baseball gave us a masterpiece of pure, unadulterated sports weirdness that will likely outlive us all.

Keep exploring

• When Movie Magic Collides With Low Ceilings: Gandalf's Best Unscripted Moment
• That Time Bruce Springsteen Thought a Fan Wanted an Autograph and Got an Entire Album Instead
• The Time Marge Simpson Politely Schooled First Lady Barbara Bush
• Take an Otter quiz