Keith Miller doubled down the third-base line and scored on a hard single to left by Darryl Strawberry.
Hernandez pulled his hamstring in St. Louis as he ran from first to third on a single by Darryl Strawberry.
He loaded the bases again in the fifth on singles by Dave Magadan and Darryl Strawberry and a walk to Howard Johnson.
In seven games, they have hit 14 home runs, 4 by Darryl Strawberry, who is batting .393.
Some hustle by Darryl Strawberry in the fifth increased the Mets' lead to 3-0.
And in the bottom of the eighth, the Mets edged in front again on three walks and a single by Darryl Strawberry that traveled about 10 yards.
He yielded six runs on seven hits, one a three-run homer by Darryl Strawberry.
But they did, starting with a home run in the bottom of the eighth by Darryl Strawberry, his 15th of the season.
In the second game, the Mets finally scored a run on one swing of the bat by Darryl Strawberry.
The Mets took the lead in the first inning on a two-out walk to Howard Johnson, who stole second base, and a single by Darryl Strawberry.