Back in the late 60s, the Cubs had a young black kid named Jimmie McMath, who was widely heralded by the press as the next Billy Williams. After all, he was black, hit left handed, played the outfield, and came from Alabama. And when, subjected probably to the same pressures as Williams, also gave up and left baseball.
Williams volunteered to go to Alabama and talk to him, and was able to convince him to give it another try. Unfortunately, it didn't work out, and although he got a cup of coffee with the Cubs, he left baseball for good a couple of years later.