![April 23, 1999: Fernando Tatis hits two grand slams in one inning](https://bdc2020.o0bc.com/wp-content/uploads/2020/08/TKUD6BSLKWVLT7JEFHHQ5WAASU-scaled.jpg)
One of MLB's rising stars hit a grand slam. He was chastised for ignoring the 'unwritten rules
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This day in sports: Fernando Tatis becomes first player to hit two grand slams in an inning - Los Angeles Times
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Hochman: 'How did you do it?' 20 years ago today, Cards' Tatis hit two grand slams in same inning … against same pitcher
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This Day in History: Fernando Tatis Sr. Hits Two Grand Slams in Same Inning! - Fastball
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Fernando Tatis Jr. Starring As San Diego Padres Continue To Struggle
![April 23, 1999: Fernando Tatis hits two grand slams in one inning](https://www.bleachernation.com/wp-content/uploads/2020/04/Fernando-Tatis.jpg)
April 23rd, 1999: Fernando Tatis Hit Two Grand Slams IN THE SAME INNING - Bleacher Nation
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The odds of hitting a grand slam - A Hunt and Peck - Viva El Birdos
![April 23, 1999: Fernando Tatis hits two grand slams in one inning](https://baseballhall.org/sites/default/files/styles/story_popup_thumb_540/public/TatisSr.Cardinals.jpg.jpeg?itok=4o6ceBSV)
Shortstops: Tatis has a home in Cooperstown
![April 23, 1999: Fernando Tatis hits two grand slams in one inning](https://img.mlbstatic.com/milb-images/image/private/t_2x1/t_w1536/milb/muiynfdt1mlc8zneovp3.jpg)
Fernando Tatis Jr. Assigned To Amarillo On Major League Rehab
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This day in sports: Fernando Tatis becomes first player to hit two grand slams in an inning - Los Angeles Times
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Lin: Friends Chan Ho Park and Fernando Tatis Sr. share baseball history—and the desire to see top Padres prospect Tatis Jr. succeed - The Athletic