What were the top sporting moments in 2017?

The year 2017 saw Roger Federer and Rafael Nadal team up for the first time in their careers, while Floyd Mayweather knocked out Conor McGregor in 'The Money Fight' in August. Serena Williams won the Australian Open while being eight weeks pregnant. Eight-time Olympic gold medalist Usain Bolt failed to finish his career's last race, during the World Championships.