Jannik Sinner just showed why he’s world No. 1—after clinching a hard-fought third-round win at the Cincinnati Open, he skipped the celebrations and hit the practice courts at 10:18 p.m. Sinner wasn’t happy with his serve, so he stayed for an extra hour, firing off 100 serves under the lights. Even after a match filled with delays and drama, he was all about improvement. This kind of dedication is wild to see—especially with the U.S. Open coming up. Do you think this relentless work ethic is what sets champions apart? #Sports #Tennis #JannikSinner