Daniil Medvedev Daniil Medvedev is a former #1 world ranked tennis player who is renowned for his anger outbursts and temper tantrums on the tennis court. He throws rackets, yells and verbally fights with umpires, and has broken camera equipment. In a recent Daily Express UK article , he admitted to being very calm when off the court and puzzling with psychologists over what his anger was all about and how to control it. Medvedev then said, of his almost 3 year old daughter,