Tennis: Rafael Nadal, Roger Federer call for 'unity' as Novak Djokovic hails new players' association

August 30, 2020 3:30 PMPARIS (AFP) - Novak Djokovic shrugged off concerns of Rafael Nadal and Roger Federer and announced the formation of a new men's pro tennis players' association that promises to put him on a collision course with his two elite rivals.