SAN FRANCISCO — With a smack of his glove and swift stride back to the dugout, Logan Webb celebrated a new career milestone.

The Giants ace wasn’t his most efficient, nor his most effective, against the Diamondbacks on Monday night. But, like he has all season, Webb reached into his back pocket and found a weapon when he needed it most.

Four runs were already on his pitching line and a potential fifth was standing on third with two outs in the fifth, as Arizona’s No. 5 hitter, Adrian Del Castillo, stepped into the box. The count ran full, and Webb fired a changeup on the outside corner that darted away from the left-handed batter.

Castillo offered and came up empty. Strike three, the 200th of the season for the ground-ball savant turned strikeout artist. A congratulatory message flashed

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