Not really sure. You'd have to look into the background and the creators' intentions to know for sure if it's a true story. Maybe it's loosely based on real events but has a lot of creative liberties taken.
It's actually not based on a true story. The plot and characters are purely the imagination of the writers. They crafted the story to entertain and engage the audience rather than drawing from real-life happenings.
The 'bottom of the ninth true story' could cover a variety of things. In baseball, this is the last chance for the home team to score and win the game. So, the story could be about the drama, the pressure, and the emotions involved. It could be about a team that had been losing all game but then made an amazing comeback in the bottom of the ninth. There might be stories of players dealing with injuries during that inning but still performing heroically, or coaches making crucial decisions at that moment to turn the game around.
Since I don't know the exact story, it's difficult to say. But if it's a baseball - related story, the main characters could be the pitcher, the batter, and the coach.
It depends on your perspective. 'Black Bottom' incorporates elements of truth but might also have fictionalized or dramatized parts for narrative effect. Overall, it has roots in reality.