All Tennis Players How Many Grand Slams Has Marin Cilić Won? Marin Čilić (Croatian pronunciation: [mâriːn tʃǐːlitɕ]; born 28 September 1988) is a Croatian professional tennis player.Marin Cilić has won 1 Grand Slam.Marin Cilić has won 1 Grand Slam. FacebookTwitterEmail How Many Grand Slams Has Madison Keys Won? How Many Grand Slams Has Jannik Sinner Won? How Many Majors Has John Isner Won?