Retired five-time Grand Slam finalist Pat Cash has claimed that the 36-year-old Roger Federer is "way better" than the Swiss men's singles player the world saw earlier in his career.Federer could become the most successful men's singles player of all time on Sunday when he faces Marin Cilic at Melbourne Park with attaining a record 20th Grand Slam win.The Swiss is yet to drop a set in this tournament so far, Cash also just dropped one set in his crowning career moment at Wimbledon in 1987, where he defeated world no.1 Ivan Lendl in straight sets in a surprise victory for the Aussie.The 52-year-old twice reached the Australian Open final in 1987 and 1988, and he holds six career titles, one Grand Slam, and attained a personal best of sixth in the ATP World Rankings.The greatest of all-time (G.O.A.T) discussions involving Federer's renaissance at the never-ending end of his tennis career have been going on for years.In a debate on Eurosport, Cash told correspondent Catherine Whittaker that: "I've said this for many years and people have mocked me, the Federer of today is way better than the Federer of before. This federer would beat the old Federer in four sets."He's got better slice backhand, better slice backhands, better serves. His gameplan of taking the game early is better and he never used to dropshot either. Now he can just torment his opponents at the net. "Wouldn't it be a sight to see this Roger Federer jerking the old Roger Federer around the court, maybe you could do that on a video game or something!"

Eurosport correspondent Whittaker joked: "Let's hope Marin Cilic isn't watching because it's a fearsome prospect of facing the greatest player of all time."

Cilic defeated Kyle Edmund in his semi-final match 6-2, 7-6 (7-4), 6-2, the Croat has also overcome Spaniards Rafa Nadal and Pablo Carreno, American Ryan Harrison, and Portuguese and Canadian Joao Sousa and Vasek Pospisll to reach the final.

Sunday will be his first Australian Open final and first Grand Slam final since Wimbledon 2017, where he lost to Federer.