Most grand slams hit by a single batter in a single inning: 2, Fernando Tatis, St Louis Cardinals, 3rd inning, April 23, 1999 Most grand slams surrendered by a single pitcher in a single inning: 2, Chan Ho Park, Los Angeles Dodgers, 3rd inning, April 23, 1999 These records may be tied, but will never be broken I am not a big Ripken fan but that one should stand for all time. All those longetivity records will be hard to reach. From your list probably the season RBI record has the best chance of falling.