MELBOURNE, Australia — For the first time in four decades, there will be no American man in the fourth round of the Australian Open. John McEnroe thinks he knows why.

The seven-time Grand Slam champion, who is working as a TV analyst at Melbourne Park, suspects a lack of passion.

“You could certainly wonder whether our guys are as hungry as some of the others,” McEnroe said on Fox after John Isner lost to 18th-seeded Feliciano Lopez in the third round Friday. “It really comes down to the individual. If people have heart or desire, that to me is more important than any shot.”

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