Marin Cilic can start the new year looking for a new coach.
The Wimbledon finalist confirmed he has split with coach Jonas Bjorkman ending a 16-month partnership.
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"We had some great results during this period and established an amazing relationship," Cilic said in a Facebook post. "It was a great pleasure to work with Jonas. I would like to thank him for all his efforts and wish him the best, in both his professional and private life."
The sixth-ranked Croat won two titles working with Bjorkman: the 2016 Basel and 2017 Istanbul championships.
Following his run to the Wimbledon final, Cilic was sidelined with an adductor injury. He suffered a third-round US Open loss to Diego Schwartzman, but bounced back to make three semifinals in a row in Tokyo, Shanghai and Basel.
Cilic qualified for the Nitto ATP Finals, but did not win a match bowing to Jack Sock, Alexander Zverev and Roger Federer as he dropped to 1-8 lifetime at the season-ending event.
Following his loss to Federer in his last match of the season in London, Cilic said he's aiming to crack the Top 3 in 2018.
"I think looking ahead, obviously I'm going to try to set goals little bit in front. (No.) 3 would be nice," Cilic said. "I'm definitely going to talk with my team. We did a lot of improvements in this year. It was extremely positive. I think I played extremely consistent throughout the season, especially starting from the clay court season.
"Overall I felt that my level has come to a new level. So hopefully even more next year, I can aim a little bit higher. Where is that going to be? You know, I'm not sure. But hopefully I'm going to be in a position to challenge the top guys and to be in contention for Grand Slams."
The 2014 US Open champion finished 2017 with a 44-22 record.