In a 12 – 4 rout of the Mariners, Boston shortstop Nomar Garciaparra hits two grand slams as well as a two-run homer, becoming the first American League player to drive in 10 runs in a game since 1975. Garciaparra clouts a bases-loaded homer in the 1st, a 2-run shot in the 3rd, and another grand slam in the 8th. Nomar is the first Bosox member since Jim Tabor, in 1939, to slam two slams in a game, and just the 9th in major league history. Robin Ventura last did it, in 1995.

May 10, 1999 This Day In Baseball

On May 10, 1999 — In a 12 – 4 rout of the Mariners, Boston shortstop Nomar Garciaparra hits two grand slams as well as a two-run homer, becoming the first American League player to drive in 10 runs in a game since 1975. Garciaparra clouts a bases-loaded homer in the 1st, a 2-run shot in the 3rd, and another grand slam in the 8th. Nomar is the first Bosox member since Jim Tabor, in 1939, to slam two slams in a game, and just the 9th in major league history. Robin Ventura last did it, in 1995.

Source:
Baseball Reference May 10

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