Roger Federer once produced a gorgeous tweener lob against Sam Querrey at the Wimbledon Championships, catching the American out completely with the audacity, creativity and precision of the shot.

—Gulbis appears to be wiry bordering on skinny on TV, and while he’s not exactly thick, like most pros he’s taller and more physically imposing in person, as if he just grew two inches since last week ...

Sinner represents the evolution of the modern serve: a blend of immense power with intelligent tactics. He uses his flat ...