Pablo Sandoval’s slump wearing on Boston fans

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They don’t much care about the World Series homers off Justin Verlander. They find the Panda hats a bit ridiculous. All the Boston Red Sox fans know about Pablo Sandoval is that he strikes the image of a very ordinary ballplayer.

At these prices — an average of $19 million a year through 2019 — that doesn’t cut it around Fenway Park. They’re looking for a third baseman who might no longer exist.

After going 0-for-4 Thursday against Minnesota, Sandoval is hitting .239 with a .306 on-base percentage and a slugging percentage of .352. He didn’t make a single error from April 25 through Saturday, but when that streak was broken Sunday against Texas, he made a second error in that game. He made two more errors Thursday. Boston fans are grumbling about a lot of things these days, and Sandoval is hardly immune.

This was a recent evaluation from Gordon Edes of espnboston.com: “Sandoval batted just .200 with four extra-base hits in May, the second-worst month of his career in which he has played at least a dozen games. The only month worse was April of last season, when he batted .177 and was supposedly distracted by contract extension talks with the Giants.

“He is a major disappointment to date.”

It’s not as if Sandoval gains instant fan support in the manner of supremely athletic teammate Mookie Betts, or the hustling Dustin Pedroia. Sandoval appears to be as heavy as he’s ever been in the major leagues, an issue likely to become intensified if the slump continues.

It will be interesting to see how he approaches A’s left-hander Scott Kazmir on Friday. Normally a switch-hitter, Sandoval was 2-for-41 batting right-handed when he decided to go exclusively lefty, and he is 4-for-12 against lefties from that side after an 0-for-4 Thursday.

Boston Red Sox' Pablo Sandoval strikes out in 6th inning against Oakland Athletics during MLB game at O.co Coliseum in Oakland, Calif., on Monday, May 11, 2015. Boston Red Sox' Pablo Sandoval strikes out in 6th inning against Oakland Athletics during MLB game at O.co Coliseum in Oakland, Calif., on Monday, May 11, 2015. Photo: Scott Strazzante, The Chronicle Photo: Scott Strazzante, The Chronicle Image 1 of / 40 Caption Close Pablo Sandoval’s slump wearing on Boston fans 1 / 40 Back to Gallery

The Giants hated to lose Sandoval, but when negotiations with his agent became too contentious, they took a new stance: Did we get the best of him? Will he ever be as good as he was in a Giants uniform?

Sandoval’s Bay Area fans know it’s a long season. His struggles could be a distant memory by autumn. In the stands of Fenway Park, there are few signs of patience.

Bruce Jenkins is a San Francisco Chronicle columnist. E-mail: bjenkins@sfchronicle.com Twitter: @Bruce_Jenkins1