To date, Elias Díaz has caught all but one of the 503 plate appearances this year against Nick PIvetta .

No reason to mess with a good thing, even with a new catcher adding much-needed offense to the position.

Díaz is behind the plate to start a three-game series against the Boston Red Sox . First pitch is at 6:40 p.m. on Padres.TV.

The 34-year-old Díaz is hitting .201/.266/.304 on the season and has just six plate appearances since the team acquired Freddy Fermin from the Royals. Díaz went 1-for-3 with an RBI while catching Pivetta’s last start against the Cardinals, came off the bench on Monday and caught Yu Darvish’s start on Tuesday (0-for-2).

Díaz had six RBIs in a four-game stretch that culminated with that RBI single in Pivetta’s last start, but the Padres clearly acqu

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