The Greek edged out a 6-3, 5-7, 7-6 (7-4) win against Grigor Dimitrov to make it through to the next round of the competition.
Marin Cilic has been one of the most consistent players on the ATP tour for years. Here we take a look at his major rivalries.
Overall, he's won a total of 6 titles - four in singles and two in doubles but where he can improve is in his Grand Slam showings.
Marin Cilic has been a steady presence on the ATP Tour circuit since he turned professional in 2005, and that's contributed to his earnings well.
In a free-hitting show on Margaret Court Arena, the Croatian blasted forehands and hammered backhands to end Rublev's time in Australia
Thanasi Kokkinakis defeated Arthur Rinderknech on Saturday to clinch dream maiden ATP Tour title at the Adelaide International 2.
Australian wild card Thanaski Kokkinakis fought his way past Croatian Marin Cilic to set up a title decider with Frenchman Arthur Rinderknech on Saturday.
Russia defeated Croatia in the final at Madrid to win the Davis Cup title after 15 years.
In the first match, Lorenzo Sonego delivered on his Davis Cup Finals debut to give Italy a 1-0 lead over the United States, defeating Reilly Opelka.
The German has been on an impressive run of form lately, as he now holds a 25-2 record since Wimbledon.