The error was on Duran, not the new guy Eaton. Do I like Mayer at 3b? Heck yes. But Mayer's OPS vs lefties is .200 and Eaton has a hot bat right now and zippo errors (1 game).
Right now the Sox are without their 2 best hitters this season, Bregman and Devers, so of course Cora wants to get righty bats in against a good lefty starter. Yesterday he had 7 righty bats against lefty Ray and scored 4 runs off him, 3 earned. The 2 lefty bats. Duran and Anthony, had 1 hit of 12 Sox hits and scored no runs and drove none in. Eaton, in for Mayer, was 2/3 and scored a run. Gonzalez had the solo dinger.
Hamilton is our best available defensive 2d baseman with a DWAR of +0.8, but he committed an error Saturday that led to 2 unearned runs in a 3-2 game SF won.
Cora ain't the problem. He throws no pitches, takes no swings at the plate, and doesn't play defense. Our pitching, hitting and defense are all inconsistent.
It is no coincidence that those 3 costly errors yesterday and Saturday came from our weakest 3 spots defensively--LF/Duran, 2b/Campbell/Gonzalez/Hamilton, and 1b Casas/Toro/Gonzalez.
Rafaela in CF, Abreu/Anthony in RF, Bregman/Mayer at 3b, Story at SS, and Narvaez at catcher are all above par defenders and play a lot of innings/games.