Kansas City Is Still Undefeated. But Its Margin for Error Is Small.

From a hole-in-one to a soccer hat trick, every game has its own version of nirvana.

In coaching, scouting, tactics, injury prevention and more, A.I. may have the capacity to transform the sport.

Chloe Primerano is the N.C.A.A.’s most highly anticipated hockey player ever, and she’s making her debut a year ahead of…