Davis Cup: Marin Cilic thrashes Kazakhstan's Mikhail Kukushkin to take Croatia into semi-finals

File image of Marin Cilic. AP[/caption]Cilic's 6-1, 6-1, 6-1 victory gave 2005 champions Croatia an unassailable 3-1 lead in the quarter-final tie.Croatia will host the US in September."From the beginning till the end I played on a rather high level ... constant pressure, superior, aggressive," former US Open champion Cilic said."I had maybe a few matches in the Davis Cup that were 'one way' ... but not really against a player of this level since Kukushkin is within (the) world top 100."Ahead of the quarter-final, the 29-year-old said that he would stop playing in the Davis Cup if Croatia win the trophy this season.Cilic had already beaten Dmitry Popko on Friday 6-2, 6-1, 6-2.On Saturday, Ivan Dodig and Nikola Mektic saw off the Kazakh pair of Timur Khabibulin and Aleksandr Nedovyesov, after Kukushkin had stunned world number 28 Borna Coric in Friday's second singles match.