WEST SACRAMENTO -- Even in a brand-new uniform, Kyle Harrison was on familiar ground Wednesday.

There could hardly be a more apt ballpark for the former Giants left-hander to make his Red Sox debut than the home of San Francisco’s Triple-A affiliate. With 26 career starts for the River Cats, Harrison definitely feels comfortable at Sutter Health Park.

“It is kind of a full-circle moment,” Harrison said. “I started the year here, so why not make the debut here with the Red Sox?”

That connection certainly didn’t hurt as Harrison turned in a solid debut for Boston, pitching three scoreless relief innings in Wednesday’s walk-off, 5-4 loss to the Athletics . The left-hander entered in the sixth inning and kept the Red Sox’s deficit to a single run, setting the stage for Rob Refsnyder’s g

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