Jack Sock — How a Masters Champion's Singles Career Disappeared

In November 2017, Jack Sock was the world No. 8 singles player, fresh off winning a Masters 1000 title and reaching the semifinals of the ATP Finals. Barely 12 months later, he had no singles ranking at all. Not a low ranking — none. Few careers in the modern game have gone from a genuine top-10 breakthrough to total freefall as quickly, or as strangely, as Sock's did.

What makes his story stand out isn't just the speed of the collapse. It's that while his singles career was disappearing, his doubles career was doing the exact opposite — rising to world No. 2 and producing back-to-back Grand Slam titles during that very same stretch. Two versions of the same player, moving in completely opposite directions at exactly the same time.

Sock's path to the top wasn't a teenage prodigy story. He won the US Open boys' singles title in 2010, turned pro the following year, and built his game steadily, picking up his first tour-level singles title in Houston in 2015. By 2017, at 25, everything came together at once.

He won titles in Auckland and Delray Beach early in the year, then capped the season at the Paris Masters, beating Filip Krajinović in the final after saving a match point earlier in the tournament, to become the first American man to win a Masters 1000 title since Andy Roddick in 2010.

The win included a victory over then-world No. 3 Alexander Zverev, the best win of Sock's career, and it catapulted him into the ATP Finals for the only time, where he reached the semifinal. He ended 2017 at a career-high No. 8, the top-ranked American man in the world. It looked, at the time, like the start of a genuine run near the top of the sport.

It barely lasted a month. Sock opened 2018 as the defending champion and top seed in Auckland — and lost his first match in straight sets. The rest of the season followed the same script: persistent injuries, early exits, and almost none of the form that had carried him to No. 8. When he returned to Paris in November to defend his Masters title, he lost in the quarter-finals to Dominic Thiem, a result that dropped him out of the top 100 entirely, having started the season inside the top 10.

2019 was worse still. Sock lost all eight singles matches he played that year, several to opponents ranked outside the top 300, with his only win of any kind coming in an exhibition — the Laver Cup, which carries no ranking points. By the end of the season, he had fallen out of the ATP rankings system altogether. A player who had beaten a top-3 opponent to win a Masters title two years earlier no longer had a singles ranking to speak of.

Here is where Sock's story stops looking like a simple decline. In September 2018 — the same season his singles ranking was in free fall — he reached No. 2 in the world doubles rankings, partnering Mike Bryan to titles at both Wimbledon and the US Open that year. He was, for a stretch, one of only two active players competing at the ATP Finals in both singles and doubles, even as one half of that résumé was collapsing and the other was thriving.

That split personality defined the rest of his career. Singles never recovered in any meaningful way — he survived largely on wildcards from 2019 onward, with a third-round run at Wimbledon in 2022 standing out as his best result in years — while doubles remained the platform that kept him relevant on tour, right through to his final professional matches.

Sock spent his final tennis seasons as, essentially, a doubles specialist who occasionally still entered singles draws. He announced in August 2023 that the US Open would be his last tournament, timing his retirement alongside fellow big-serving American John Isner, with whom he'd first played the US Open as a 17-year-old. The two teamed up in men's doubles one final time, and Sock also played mixed doubles with Coco Gauff on his farewell day.

Fittingly for a career defined by near-misses in its second half, he served for both of his final matches and was broken each time, losing both. He left the court in tears to a standing ovation, 30 years old, with a singles ranking of 485 and a doubles ranking of 199 — numbers that told only part of the story of a player who had once beaten a top-3 opponent to win one of tennis's biggest non-major titles.

Sock didn't wait long to find his next competitive outlet. Within a day of his retirement announcement, he had signed with the Professional Pickleball Association tour, later explaining that fatherhood, more than a lack of tennis ambition, drove the decision — he wanted to be present at home rather than living out of a suitcase. By late 2025, he had climbed to around world No. 6 in pickleball singles, and said he felt increasingly confident a couple of years into the switch.

Asked to reflect on his tennis career, Sock didn't point to the Masters title or the Grand Slam doubles trophies as his proudest achievement — he named representing the United States at the 2016 Rio Olympics instead. It's a fitting note for a career that never quite followed the script: a singles run that vanished almost overnight, a doubles career that thrived in its shadow, and an ending that came not from injury or decline alone, but from a 30-year-old deciding, on his own terms, that there was somewhere else he'd rather be.