In 2015, Marcus Semien was probably the worst defensive player in all of Major League Baseball.
That's not hyperbole. The A's shortstop committed a mind-boggling 35 errors, eight more than any other player in the league.
Fast forward to 2018 and Semien had transformed himself into a Gold Glove Award finalist. How was that type of improvement possible in just three years?
Semien credits one man: Ron Washington.
"He's the reason that happened. I'm out there playing the game but I always imagine him still coaching me and talking to me. It's helped me so much.