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Serena Williams. Photo: Jason Heidrich/Icon Sportswire via Getty Images

Serena Williams remains one win shy of equaling Margaret Court's all-time record of 24 major singles titles.

The backdrop: Williams, 38, has been within one match of tying Court's record four times, but lost in the finals of Wimbledon and the U.S. Open each of the last two years.

Women to watch: Ashleigh Barty, the reigning French Open champion, is Australia's best chance for a homegrown singles winner since Chris O'Neil claimed the 1978 women's title.

  • Young Americans: 15-year-old Coco Gauff is back and better than ever, and 18-year-old Amanda Anisimova has found solace on the court since her father's sudden death last summer.

Men: Novak Djokovic, Rafael Nadal and Roger Federer were the three best players on the ATP Tour in the early 2010s. A decade later, they're still on top — but the next generation is closing in.

By the numbers: "The Big Three" have won 55 of the past 66 Grand Slams, but youngsters like Daniil Medvedev, Stefanos Tsitsipas, Dominic Thiem and Alexander Zverev represent the best bets to break their iron grip on the sport.

  • What they're saying: "They're coming closer and closer, it's obvious," Djokovic told reporters in Melbourne. "I think they are definitely hungry. They're challenging. They're knocking on the door."

Go deeper: 15-year-old Coco Gauff becomes youngest tennis titlist in over a decade

Go deeper

1 hour ago - World

Mapped: The world's most and least corrupt countries

Expand chart
Data: Transparency International; Map: Jared Whalen/Axios

The most corrupt governments in the world are in South Sudan, Syria and Somalia, according to Transparency International's annual index, while the "cleanest" are in Denmark, Finland and New Zealand.

  • Breaking it down: The U.S. is 27th, China 66th, India 85th, Brazil 96th and Russia 136th. Scroll over the map to see each country's ranking.

Crypto leads to massive surge in online scams

Expand chart
Reproduced from FTC; Chart: Axios Visuals

Bogus cryptocurrency investments led to an unprecedented increase in online scams last year, according to new data from the Federal Trade Commission (FTC).

Why it matters: Cryptocurrency is an easy target because while it's surging in popularity, there's still a lot of confusion about how it works.

Tina Reed, author of Vitals
4 hours ago - Health

New clues emerge on long COVID

Illustration: Maura Losch/Axios

The presence of certain autoantibodies or high amounts of coronavirus RNA in the blood could be indicators a patient has a higher chance of developing long COVID, according to a new study in the journal Cell.

  • Other factors include a person having Type 2 diabetes or the reactivation of the Epstein-Barr virus.