Assuming the tennis ball retains the same mass, I will make the tennis ball big enough such that the outer shell of tennis ball is a few atoms thick. So maybe the size of earth? Drop it from one millimeter. The only down sides of this are that the tennis ball is displace a huge amount of air in our atmosphere, devastating air currants and weather. Since that the interior of the tennis ball will be a near vacuum, it will also be incredibly buoyant in the atmosphere. I don’t think the gravitational attraction of the earth on the near side of the tennis ball will be enough to overcome the buoyancy, so I will have to jump very quickly to make contact with it. As the tennis ball’s shell makes contact on my head it will likely rupture. All the displaced air will now fill the colossal void left by the tennis ball. I will be sucked up into the vortex and likely murderlated by the sheer force on my body. The ensuing maelstrom will level buildings and destroy everything on the North American continent except the mountains. The tsunami ripples of air will continue to rebound around the whole planet for months if not years.

I will leave all my prize money to whomever survives. Because a tennis ball is .06 kg and the prize money is $10,000 per kilogram per meters dropped. So I think the result is around $6.