It's common knowledge that the marriage of John McEnroe and Tatum O'Neal is on the rocks, but some friends of the bad boy of tennis are holding out hope that the couple will be able to patch things up.

McEnroe and O'Neal have been married six years and have three young children, but she reportedly got fed up when he vetoed her plans to resume her acting career. Still, one of McEnroe's friends doubts they'll actually get a divorce.The unidentified friend told People magazine, "Everyone who knows them is pretty blown away by it. They are really close to their kids and have worked real hard to spend time with them."

The friend added, "I think John is really wanting to work it out. I'm sure (the split) is something he never planned on doing."