We saw this at the Meadowbrook Theater in Rochester, Michigan in 1991. My memory of it is slim. Blessing also wrote the wonderful WALK IN THE WOODS, but this play was not up to that standard.
Most of the trouble lay with the miserable person Cobb was. But he was miserable in uninteresting ways. The play showed him at three ages and used three performers to do that. Although there were some interesting aspects to his story, it was not enough to save this play.
The thing about him was--he was a great ballplayer and there was no way to get that on the stage. So you are left with a miserable racist that nobody liked.