'Old man' Novak trying to conquer young man's game

Novak Djokovic (right) is 38 and trying to conquer a younger man's game as he heads into the US Open semifinals today.

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New York - It's been two years since his most recent Grand Slam title, which - to him - must feel like an eternity.

Last season was his first without earning at least one since 2017. And Djokovic is clear that, at this point in his career, those big trophies from the sport's four biggest events are all he really cares about.

At this year's three other major tournaments, he exited in the semifinals, two after getting hurt: quitting at the Australian Open because of a torn hamstring and clearly limited at Wimbledon by an injured groin muscle. He hadn't competed anywhere since leaving the All England Club in July until arriving at Flushing Meadows.