Coco Gauff and Naomi Osaka meet at a tennis coaching crossroads in Beijing

The ‘other guy’ theory of coaches in sports suggests that teams often replace coaches who do not bring success with different types of personalities. A ‘players’ coach’ may be swapped for a disciplinarian, while reserved coaches may be replaced by high-energy, motivational types. Eventually, bookish coaches focusing on strategy may come back into favor when other coaching styles become less effective.

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