2009 Australian Open – Men's singles final Open victory, Federer had not beaten Nadal in a Grand Slam since the 2007 Wimbledon final and many analysts pointed to the 2009 Australian Open final as the match which severely compromised Federer's belief that he could win against Nadal in a major. Mats Wilander proposed that Federer had developed a mental block while playing against Nadal and that their rivalry had become one-sided and predictable after this match. Tennis Channel commentator Justin Gimelstob referred to Federer's loss as a type of 'collateral damage' in which Federer not only lost a tennis match but also lost his last remaining stronghold
2017 Australian Open Series not lose a set during the tournament. She also regained the No. 1 ranking, defeating her sister Venus Williams in the final, 6–4, 6–4. This marks the first time the Williams sisters met in a Grand Slam final since the 2009 Wimbledon Championships and the first time they met in the Australian Open final since 2003. Serena's victory was her 23rd Grand Slam title in singles, surpassing Steffi Graf as the all-time leader in Grand Slam titles in the Open era. 2017 Australian Open Series In tennis, the 2017 Australian Open Series, (sometimes known as the 'Australian Summer of Tennis'