Rafael Devers is already looking like the best trade the Mariners never made

San Francisco Giants v Atlanta Braves | Kevin C. Cox/GettyImagesWhen Rafael Devers was traded from the Boston Red Sox to the San Francisco Giants in June, many Mariners fans wondered why Seattle did not make the trade themselves for the veteran third baseman. The M's still need help at the hot corner, after all, and Devers is a three-time All-Star at the position.

Looking back, it looks like the best trade the Seattle Mariners never made.

The Mariners may have dodged a bullet in not trading for Rafael Devers

Devers has played 30 games in San Francisco and has been worth -0.1 bWAR. He's slashing .227/.336/.345, good for an OPS+ of 99. That's 51 points below the 150 OPS+ he was putting up in…