The 28-year-old Frenchwoman made the shock announcement on Wednesday after losing to Simona Halep in the second round of the Western & Southern Open in Cincinnati.
Bartoli’s decision comes only 40 days after she achieved her dream of winning Wimbledon with a straight-sets defeat of Sabine Lisicki.
“What she did at Wimbledon was fantastic but she will regret this decision when Wimbledon comes,” said Ivanisevic, who returns to London for the Statoil Masters Tennis in December.
“There is nothing like playing at Wimbledon as Wimbledon champion.” Former French player Guy Forget worries Bartoli has made a rash decision and has urged her to take time to think it through.
Forget, who like Ivanisevic is playing in the Optima Open in Belgium this week, said: “I’m always very cautious about someone’s quote right after a defeat.
“I hope she is going to change her mind.
You don’t want to have regrets looking back. Being a professional player is such an exceptional job and you don’t want to look back in a few months or years and think, ‘Why did I stop?’
“(My message would be) just don’t rush it. Take time, go to the beach for a few days, go running in the park, just get your head together, spend some time with your friends.
“And, if you don’t want to play the next week, just don’t play it. If you want to miss the US Open, fine, but just don’t quit, don’t take such a radical decision only a few weeks after winning the biggest tournament in the world.”