Jelena Ostapenko is a Latvian right-hander who won the French Open as an unseeded seventeen-year-old, one of the most surprising Grand Slam breakthroughs of the past decade, powered by extraordinarily flat, fearless ball-striking. Her all-or-nothing style, going for winners from almost anywhere on the court, has made her one of the most unpredictable and dangerous opponents on tour, capable of beating any player in the world on a given day even as her results elsewhere have varied.