Who won the Men's Final Australian Open Tennis Championship 2017?

Concept

This is a current-affairs / general-knowledge question about a Grand Slam title. The Australian Open is the first of the four annual Grand Slam tennis tournaments, held in Melbourne each January. The men's singles champion is the player who wins the final, and identifying that champion for a given year is a matter of recorded sporting fact.

Application

In the 2017 Australian Open men's singles final, the title was won by Roger Federer, who defeated Rafael Nadal in a five-set final (6-4, 3-6, 6-1, 3-6, 6-3). This was Federer's 18th Grand Slam singles title and his fifth Australian Open crown, achieved after returning from a six-month injury layoff.

Cross-check / Contrast

Distinguish the champion from the other names offered, all of whom were leading players of the era but did not lift this particular trophy:

• Rafael Nadal reached this final but finished as the runner-up after the deciding fifth set.

• Stanislas Wawrinka was a Grand Slam winner of the period (including a 2014 Australian Open title) but was not the 2017 finalist who claimed the trophy.

• Novak Djokovic, a multiple-time Australian Open champion, did not contest this particular final.

Hence the 2017 Australian Open men's singles champion was Roger Federer.