Question: who has won the mens singles title in the australian open tennis tournament?
Answer: Roger Federer

Men 's Singles 2018 Australian Open Champion Roger Federer Runner - up Marin Čilić Final score 6 -- 2 , 6 -- 7 , 6 -- 3 , 3 -- 6 , 6 -- 1 Details Draw 128 ( 16 Q / 8 WC ) Seeds 32 Events Singles men women boys girls Doubles men women mixed boys girls Legends men women mixed WC Singles men women quad WC Doubles men women quad ← 2017 Australian Open 2019 →