MELBOURNE, Australia (AP) — Roger Federer’s farewell to professional tennis was filled with tears, tributes and a standing ovation that lasted for several minutes. It also included one last competitive match alongside his longtime rival Rafael Nadal. But most of all, it was a celebration of a remarkable career that spanned two decades and included a record 20 Grand Slam singles titles. Federer announced his retirement last week, saying his body had sent him a .