2005 – After fouling off three Jose Valverde full-count fastballs, Mike Jacobs goes deep at Bank One Ballpark to become the only player to hit four home runs during the first four games of a major league career. The Metsrookie, who hits two round-trippers in the 18 – 4 rout of the Diamondbacks, has homered four times, including his first big league at-bat, in his first 13 plate appearances.

On August 24, 2005 — 2005 – After fouling off three Jose Valverde full-count fastballs, Mike Jacobs goes deep at Bank One Ballpark to become the only player to hit four home runs during the first four games of a major league career. The Metsrookie, who hits two round-trippers in the 18 – 4 rout of the Diamondbacks, has homered four times, including his first big league at-bat, in his first 13 plate appearances.

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Sources:
Baseball Reference August 24
National Pastime August 24
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game