The NFL introduced the so-called dynamic kickoff last year, limiting how far the coverage team has to run and establishing a landing zone inside the 20-yard line.

Not long after came a seismic jolt, the helicopter crash of Kobe Bryant in the fog-shrouded California hills that reverberated across sports and across continents. Deep into the year, a bookend to Bryant, Diego Maradona died from a heart attack in Argentina weeks after brain surgery, the waves of grief rippling across soccer. The losses, of course, came against a backdrop of a pandemic, its number of fatalities rolled out daily on TV screens. Niekro won 318 games and pitched until he was 48, his knuckleball dancing and mystifying batters across the decades. Kurt Thomas in 1978 became the first U.S. male gymnast to win a world title but lost an Olympic shot in 1980 because of the boycott.