Hank Green

Rookie Grand Slam tournament champs often fall short at their next major. All Naomi Osaka did was conquer the world again. A little more than four months after shocking the great Serena Williams at the U.S. Open last September, Osaka lost three match points in the second set of the Australian Open final. If she had wilted, no one would have blinked. Osaka, 21, is still young. She had her U.S. Open moment to fall back on. But no—Osaka controlled her mind and let her superior power do the work. She won another Slam.