Novak Djokovic heads to the French Open?this year facing a familiar opponent, but one that cannot be outmaneuvered even by the record 24-time Grand Slam champion: time.

The Serbian, who turns 39 this week, is no longer the immovable presence he once was, his famed durability now increasingly a concern in a sport shaped by younger, physically explosive rivals.

The question is not simply whether he can win another French Open, but how he continues to adjust his game and mindset to defy the natural erosion that comes with advancing years.