Water Polo is arguably the hardest sport in the world. Being tossed into the deep end of an Olympic sized pool, having to tread water for thirty minutes while attempting to grab a ball and dodge vicious opponents, can be extremely difficult at some times. Even though each player gets their fingernails clipped you will still see players leaving the pool covered in bruises, scratches, and welts, and sometimes the swimsuits are in tatters. Roughly 80% of your body is underwater at all times and keeping the other 20% up is hard. This all makes water polo the hardest sport in the world.