Kardon, a former coach of 18-time Grand Slam champion Martina Navratilova was hired on trial basis in February to replace Sven Groeneveld.
However, Ivanovic's ranking continued to drop from no. 8 to no. 13 in this week’s WTA rankings after her French Open title defense ended in the fourth round.
“I’d like to thank Craig for all his hard work,” Ivanovic said.While searching for a new coach, she will use temporary coaches for Eastbourne and Wimbledon later this month.
“He’s a great guy and I enjoyed working with him.”