Martina Navratilova says that No. 5 Andy Murray needs to give himself a kick in the pants if he's going to win a Grand Slam title.

"I would have though he would have won a Slam by now, though he still has plenty of time on his side," Navratilova said of the 23-year-old, who has lost in three major finals. "He's still in his prime, the next three to four years, but with every year it gets more difficult, the expectations and the pressure get higher. He's got the talent but he's got to get tougher on himself mentally—he's too quick to pass the blame, looking at his box and yelling at them as if it's somehow their fault he missed that forehand. Also, he doesn't give his opponent enough credit, he gets mad when he gets aced—that's a good serve, too good. He needs to change his attitude, to give his opponent more credit which takes the pressure off him."

Navratilova made the remarks at promotion for the Liverpool International exhibition, where she will take on Martina Hingis in June.—Matthew Cronin