In this week's MMA, I rank the biggest disappointments and surprises of the Aussie Open so far. I react to Stefanos Tsitsipas making his first slam semifinal with a win over Roberto Bautista Agut. Then I preview the remaining quarterfinal matchups, Rafael Nadal vs. Francis Tiafoe, Novak Djokovic vs. Kei Nishikori, and Milos Raonic vs. Lucas Pouille. Lastly, I give my thoughts on Roger Federer's announcement that he will likely play the clay court season.