The four-time major champion announced that she had parted ways with coach Patrick Mouratoglou following middling results. Will the change spur a career renaissance?

Naomi Osaka’s tennis career has been, quite frankly, a rollercoaster. Not just any rollercoaster, but one of those heart-in-your-throat drops-with-a-couple-of-loops type of rides.

Osaka has won only one title while collaborating with Mouratoglou – more precisely the Saint-Malo WTA 125 – really too little for a champion of her caliber, who has made the recent history of women's tennis by becoming a point of reference for all her rivals.