Novak Djokovic is on the cusp of a second 'Nole Slam' as he prepares to win a seventh Australian Open title. Julian Finney / Getty Images
Novak Djokovic is on the cusp of a second 'Nole Slam' as he prepares to win a seventh Australian Open title. Julian Finney / Getty Images

Novak Djokovic and Serena Williams chase milestones: Australian Open talking points