It's not often that a man is able to follow up his first Grand Slam title by repeating as the champion at the same tournament a year later, which is what Jannik Sinner will be trying to do Sunday when he faces Alexander Zverev in the Australian Open final.
The last time it happened was nearly 20 years ago: Rafael Nadal accomplished that sort of repeat at the 2005 and 2006 French Opens. He turned out OK.
