A ball head on a monopod is problematic and best left to tripod use as others have pointed out. Most sport photogs don't use any head on a monopod because they rarely shoot at extreme vertical angles and simply adjust the angle of the support to achieve the desired shot. If however, you are shooting subjects that will require extreme vertical angles then a head with one axis adjustability is prime. Depending on your ecosystem of head attachment some are better than others.
My preferred setup is Arca Swill camera and lens plates with clamps on my tripod ball heads and monopod. All are of Really Right Stuff make and the MH-01 monopod head is extremely well made and can support any lens combo you like. It comes in various clamp styles and is available through
B&H Photo now.