LONDON - Former No. 1 Ana Ivanovic has split with her coach Craig Kardon.
The Serb had hired Kardon, who is a former coach of 18-time Grand Slam champion Martina Navratilova, on a trial basis in February to replace Sven Groeneveld.
Ivanovic dropped from No. 8 to No. 13 in this week's WTA rankings after her French Open title defence ended in the fourth round.
"I'd like to thank Craig for all his hard work," Ivanovic said Tuesday on her website. "He's a great guy and I enjoyed working with him."
She will use temporary coaches for Eastbourne and Wimbledon later this month.
The 21-year-old Ivanovic had a stellar 2008, winning the French Open and holding the No. 1 ranking for nine weeks.