Major League - most runs batted in (innings)
- Who
- Fernando Tatis
- Where
- Not Applicable
- When
- 23 April 1999
Fernando Tatis (Dominican Republic) of the St Louis Cardinals (USA) made Major League Baseball history by hitting two grand slam home runs in one inning, both against pitcher Chan Ho Park (South Korea), during the third inning of a game against the Los Angeles Dodgers at Dodger Stadium, in Los Angeles, California (USA), on 23 April 1999. With this feat, Tatis also set a MLB record with 8 RBIs in one inning.