Jul 16, 2024, 07:56 AM ET

The greatest athlete of the 21st century? That’s easy. It has to be Tom Brady, the quarterback of the greatest dynasty America’s favorite sport has ever seen, a seven-time Super Bowl champ and five-time Super Bowl MVP. Yep. Tom Brady.

Except. Except it has to be Lionel Messi, the best player in the world’s favorite sport, an eight-time Ballon d’Or winner as the footballer of the year. Yep, definitely Messi.

Except … no … LeBron James, right? Four-time NBA champ, four-time Finals MVP, four-time regular-season MVP, 20-time All-NBA, most points scored in NBA history. No athlete has dominated the public conversation like LeBron has. He has to be No. 1.

Except, what about Serena Williams? Winner of 23 Grand Slam titles, the Serena Slam (holding all four major titles at the same time) and four Olympic gold medals. And she got her final Grand Slam event win while pregnant, putting her career on hold while she was at her most dominant.

Except, if you are going to pick a tennis player, what about Roger Federer? He transformed an entire sport with his artistry, his chess game on the court, his blazing forehand. He won 20 Grand Slam titles and became the most beloved tennis player of all time. Gotta be Fed.

Yeah, except Rafael Nadal won 22 Grand Slam titles and Novak Djokovic has won 24. You have to pick one of them over Federer.

Hmm. Maybe this isn’t so easy. We didn’t even mention the Olympians: Usain Bolt and Michael Phelps and Katie Ledecky and Simone Biles. Or Kobe. Gotta throw Kobe Bryant into the discussion. Or Lewis Hamilton. Or Peyton Manning. Or Floyd Mayweather. Or Tiger. Geez, almost forgot about Tiger Woods.

Yes, ranking the top 100 most accomplished athletes since 2000 wasn’t quite so easy after all — but it sure was fun. Twenty-five years ago, the ESPN SportsCentury project ranked the top 100 North American athletes of the 20th century. Michael Jordan came in first, followed by Babe Ruth, Muhammad Ali, Jim Brown and Wayne Gretzky. (Ruth should have been No. 1, but hey, I’m a baseball writer.) We also ranked a horse: Secretariat came in at No. 35.

With so many transcendent athletes over the past 25 years, we thought it was time to do another ranking. I promise you there are no horses this time (sorry, American Pharoah). In considering the best athletes of the 21st century, however, we have expanded our choices beyond North America. ESPN editions from around the globe contributed to the nominations and voting process, as well as the individual sport list rankings that will follow.

Voters were instructed to consider only an athlete’s performance since 2000. So, for Barry Bonds: He won seven MVP awards, but only four of those came after 2000, as did 317 of his 762 home runs. Or Ken Griffey Jr.: He played until 2010, but all of his best seasons came in the 1990s. Tiger won 13 of his 15 majors from 2000 on, so he’s in good shape. Other athletes, such as Patrick Mahomes or Nikola Jokic or Shohei Ohtani, obviously have more greatness ahead of them, so we’ll see how high their accomplishments so far get them on the list.

In the end, we received more than 70,000 votes from ESPN contributors to create our top 100. We will reveal 25 athletes every day this week until we reach our No. 1 athlete of the 21st century.

Let the arguments begin. — David Schoenfield, ESPN senior writer

Methodology

Experts in individual sports were asked to vote to rank the top athletes in their sport since Jan. 1, 2000 (no accomplishments before this date were to be considered). Those votes pared down pools in each sport to lists of 10 to 25 athletes each, which constituted the overall candidate pool for the top athletes of the 21st century so far. Each voter was presented two randomly selected names and asked to pick which one has had the better career in the 21st century. Across repeated, randomized head-to-head matchups, more than 70,000 votes were cast at this stage, and using an Elo rating system, the list was pared down from 262 to 100. That list was then evaluated by a panel of experts for any inconsistencies or oversights, resulting in the top 100 ranking seen here.