9 players were tied for the most grand slams in the 5th inning in 2017, with 1 grand slam. The first three are Jaime Garcia, Welington Castillo and Eugenio Suárez.
| NAME | GRANDSLAM | SEASON | TM | G | AB | H | 2B | 3B | HR | RBI | BB | HBP | SO | PA | TB | XBH | SH | SF | IBB | AVG | OBP | SLG | OPS | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  | J. Garcia | 1 | 2017 | TOT | 10 | 8 | 2 | 0 | 0 | 1 | 6 | 0 | 0 | 3 | 10 | 5 | 1 | 2 | 0 | 0 | .250 | .250 | .625 | .875 |
| 2 |  | W. Castillo | 1 | 2017 |  BAL | 43 | 40 | 11 | 0 | 0 | 3 | 9 | 3 | 0 | 11 | 43 | 20 | 3 | 0 | 0 | 0 | .275 | .326 | .500 | .826 |
| 3 |  | E. Suárez | 1 | 2017 |  CIN | 60 | 46 | 6 | 0 | 0 | 4 | 9 | 12 | 2 | 13 | 60 | 18 | 4 | 0 | 0 | 0 | .130 | .333 | .391 | .725 |
| 4 |  | J. Mauer | 1 | 2017 |  MIN | 69 | 57 | 22 | 7 | 0 | 1 | 8 | 11 | 1 | 4 | 69 | 32 | 8 | 0 | 0 | 0 | .386 | .493 | .561 | 1.054 |
| 5 |  | C. Owings | 1 | 2017 |  ARI | 33 | 30 | 11 | 3 | 0 | 1 | 5 | 2 | 0 | 6 | 33 | 17 | 4 | 0 | 1 | 0 | .367 | .394 | .567 | .961 |
| 6 | | M. Adams | 1 | 2017 | TOT | 30 | 28 | 8 | 3 | 0 | 2 | 8 | 2 | 0 | 10 | 31 | 17 | 5 | 0 | 1 | 0 | .286 | .323 | .607 | .930 |
| 7 |  | J. Upton | 1 | 2017 | TOT | 67 | 62 | 14 | 4 | 0 | 1 | 8 | 4 | 1 | 23 | 67 | 21 | 5 | 0 | 0 | 0 | .226 | .284 | .339 | .622 |
| 8 |  | T. Flowers | 1 | 2017 |  ATL | 37 | 27 | 13 | 2 | 0 | 1 | 9 | 6 | 3 | 7 | 37 | 18 | 3 | 0 | 1 | 0 | .481 | .595 | .667 | 1.261 |
| 9 |  | M. Zunino | 1 | 2017 |  SEA | 53 | 46 | 13 | 3 | 0 | 4 | 9 | 5 | 2 | 21 | 53 | 28 | 7 | 0 | 0 | 0 | .283 | .377 | .609 | .986 |
StatMuse has event-level data for grand slams going back to the 1974 season.
Some of the information used here was obtained free of charge from Retrosheet.
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ATH 
