There could be several main characters in the 'ball hawk short story'. The obvious one would be the 'ball hawk' - the person with the amazing ability to get the ball. There might also be an antagonist, perhaps a rival player from another team who is constantly trying to outwit the ball hawk. Additionally, if the story delves into the ball hawk's personal life, there could be family members or friends who play important roles.
In the 'ball hawk short story', the main character is likely the ball hawk. However, depending on the nature of the story, there could be other important characters. For instance, if the story is about the ball hawk's growth and development in a team sport, there would be teammates who support or compete with the ball hawk. There could also be a mentor figure, like an old - timer who gives the ball hawk advice on how to improve his or her skills. And if the story has a love interest angle, there could be a character who is attracted to the ball hawk because of his or her talent and success on the field.
Since I don't know the specific 'ball hawk short story', it's hard to say. But it could be the ball hawk himself/herself as the main character. There might also be coaches or teammates if it's a sports - related story.