PHOENIX — As the Giants cling to their fading playoff hopes, they’re searching for pitching help wherever they can get it.

Ahead of Tuesday’s quasi-bullpen game against the Arizona Diamondbacks, the Giants optioned right-hander Keaton Winn and recalled right-hander Trevor McDonald, who has yet to pitch an inning in the majors this season.

“It’s something you have to do,” said manager Bob Melvin. “(Kai-Wei) Teng pitched pretty well last night. … Just kind of blew up on us in the sixth. You know you’re going to have to go through these. We’ve had some games where we’ve been successful with it and other ones we haven’t.”

The Giants’ bullpen, due to both injuries and trades, has undergone significant changes over the last two months. Left-hander Erik Miller hasn’t pitched since early July d

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