Marin Cilic loses in straight sets to Tomas Berdych at ATP World Tour Finals Marin Cilic. As Rafael Nadal arrived for a post-surgery promotional appearance at the ATP World Tour Finals, the man who took his place in the eight-man field was effectively departing, US Open champion Marin Cilic losing his second match, comprehensively, in straight sets. The first was 6-1-, 6-1 to Novak Djokovic; on Wednesday it was 6-3, 6-1 against sixth seed Tomas Berdych. Cilic has had a whirlwind year, with a drug suspension and his maiden grand slam title, but this has been an inauspicious debut at the season finale at London's O2 Arena. He was disappointed. Not expecting it. A little weary. Etcetera. Still has a token final match against Stan Wawrinka. "But, anyway, I'm going to try to enjoy," he said. I deserve to be here as a matter of having a great season. Of course, try to play well and to perform well on Friday. But after Djokovic thrashed Wawrinka 6-3 6-0, there remained a glimmer of hope for Cilic. Should he beat Wawrinka in straight sets, and Djokovic produce the same result against Berdych, there is still a chance Cilic can make the semis on games ratio. Berdych started with a shocker, too, against Wawrinka, also humbled 6-1, 6-1. But the Czech has proved himself a dab hand at losing his first match and winning his second, and so it is again at his fifth World Tour Finals appearance. I felt much better on the court. But still it was not one of my best. That's fair to say," Berdych said. But I think that's the beauty of this event. One day you can be swept out from the court like I (was)... and in two days' time you can come up and you can play a different tennis. Basically there were no miracles in that time in between the matches. But I just had a good practice session yesterday, good rest, refocused again, and go for another match. More importantly, it's like 'stay self‑confident, self‑belief, really just keep on going, keep on pushing. You're not going to get nothing for free. You just have to work for it hard, that's it'. And harder still in his remaining round-robin match, against top-ranked Djokovic, whom he trails 2-16 head-to-head. "I'm going to try to (win) maybe three, four games," Berdych quipped. That would be better from the last time (6-0, 6-2 last month in Beijing). But even if it's the last one, it's with the No.1 player in the world. As for Cilic, the Croatian had claimed his previous two matches against Berdych, but after dropping a sloppy opening service game, never looked like taking this one. Asked for a critique, Berdych said, after a preamble: "Let's put it this way: with the way he played, he would never win a US Open."