Joe Ward

Sunisa Lee has been practicing a new difficult element in her uneven bars routine. If she completes it at the Olympics, it will be named “The Lee.”

They started playing football as kids, began to suffer mentally and died before 30. Researchers found they had C.T.E., the brain disease linked to hits to the head. If their families could go back, would they still let them play?

A detailed look at a critical element of elite serving that can determine who wins each point in a tennis match.

With five clean quadruple jumps, see how Nathan Chen skated effortlessly to Olympic gold, four years after missing the podium.

How Katie Ledecky’s competitors are closing the gap on her dominance in the pool.

Here’s how Sunisa Lee of the United States won the Olympic gold medal in the all-around gymnastics competition at the Tokyo Games.

An increasingly popular power-play formation, the 1-3-1, is giving N.H.L. scorers many more options — and goaltenders many more headaches.

Here’s what we know about what’s happening at the border.

The power game will be on display in this year’s women’s U. S. Open final when two of the hardest hitters in the game, Serena Williams and Naomi Osaka, square off. It will be the first Grand Slam final for Osaka who has burst onto the scene with one of the most powerful forehands in women’s tennis.

Service returns in tennis have evolved in recent decades, and Novak Djokovic typifies the change as much as any player on the pro tour.