Tennis Dark Horses to Watch for 2026’s Slams

Alexander Zverev walked into the 2026 French Open final having lost three previous major finals. He walked out with his first Grand Slam title, beating Flavio Cobolli in five sets after Carlos Alcaraz withdrew injured and Jannik Sinner suffered a stunning second-round exit. Weeks later, Linda Noskova won her first major at Wimbledon. If two straight majors just went to players outside the usual conversation, the tennis dark horses heading toward the US Open deserve a lot more attention than they are getting.

The gap between the established favorites and the next tier of players has never been thinner. Here are the names worth watching closely as the tour heads into the final stretch of the season, players with the game, the results, and the momentum to make real noise at the US Open and beyond.

Why Dark Horses Are Actually Winning Majors Now

For most of the last two decades, a small handful of names dominated Grand Slam finals. That grip has loosened. Injuries, scheduling fatigue, and a genuinely deeper talent pool across both tours mean that a player ranked outside the top eight now has a real path through a major draw. The 2026 season has already proven the point twice, and both the ATP and WTA fields behind the headline stars are stacked with players capable of pulling off the same kind of run.

Men’s Dark Horses to Watch

João Fonseca

The 19-year-old Brazilian closed out last season by winning titles in Basel and Buenos Aires, rocketing to a career-high world No. 24. Fonseca’s game combines a huge forehand with genuine flair, and he plays with a fearlessness that has already produced upsets against far more experienced opponents. As his consistency catches up to his ceiling, a deep run at a hard-court major feels increasingly plausible.

Jakub Mensik

Mensik’s breakthrough already has a signature moment: beating his idol Novak Djokovic in the 2025 Miami Open final to claim his first Masters 1000 title. The 20-year-old Czech stands 6-foot-4 with one of the biggest first serves on tour and a hold percentage that ranks among the very best in the sport. He is only a handful of consistency improvements away from becoming a fixture in the top 10, and a big hard-court run in New York would go a long way toward getting him there.

Learner Tien

The American teenager has climbed quickly enough to earn a top-eight seed at this year’s Washington Open, playing alongside far more established names like Taylor Fritz and Daniil Medvedev. Tien’s two-handed backhand and clean shot-making have drawn comparisons to a young Djokovic, and playing meaningful summer hard-court matches on home soil sets him up well heading into the US Open.

Women’s Dark Horses to Watch

Victoria Mboko

Few breakthroughs in recent tennis history have moved as fast as Mboko’s. The Canadian won a WTA 1000 title on home soil in Montreal, added a second title in Hong Kong, and rocketed to world No. 9 in the process. Working with respected coach Wim Fissette, Mboko now enters every tournament as a legitimate threat rather than a surprise name in the draw, and a deep US Open run would confirm she belongs in the sport’s true upper tier.

Diana Shnaider

After a breakout 2024 campaign that pushed her to a career-high world No. 11, Shnaider dipped in 2025 but remains just outside the top 20 with five career WTA titles already banked despite only three full seasons on tour. A player with that kind of title-winning track record rarely stays outside the top tier for long, and a resurgence at the US Open would not be a shock to anyone who watched her 2024 run closely.

Alex Eala

Eala made history this year as the first Filipina player ever seeded at Wimbledon, a milestone that reflects just how quickly her ranking has climbed. Her all-court game and calm demeanor under pressure have already produced wins over seeded opponents at tour level, and a summer hard-court swing suited to her flat, aggressive ball-striking could be exactly what pushes her into her first major second week.

What Separates a True Dark Horse From a Contender

Not every unranked name in a draw deserves dark horse status. The players worth tracking closely tend to share a few traits:

• A signature win already on the resume, proof they can beat a top player under pressure, not just in theory
• A title or deep run within the last twelve months, showing the results are recent rather than a distant flash
• A game style suited to the surface ahead, since a clay-court breakout does not always translate cleanly to hard courts
• Rising confidence against seeded players, which usually shows up before the ranking numbers fully catch up

Where to Watch Them Prove It

The US Open swing, running through Washington, Canada, and Cincinnati before the year’s final major begins in late August, is exactly the kind of stretch where dark horses either confirm their potential or fade back into the pack. Watch how these players perform specifically on hard courts over the next month, since that surface will decide whether their recent form translates into an actual deep run at Flushing Meadows.

The Next Surprise Champion Is Already in the Draw

Zverev and Noskova prove that a Grand Slam breakthrough rarely announces itself in advance. The players on this list already have the wins, the titles, and the ranking trajectory to suggest they belong in that same conversation. Keep an eye on all six names through the rest of the summer, because one of them winning a major before the year ends would surprise almost nobody who has actually been paying attention to their recent form.

Frequently Asked Questions

Who are the biggest ATP dark horses heading into the US Open?

João Fonseca, Jakub Mensik, and Learner Tien are among the most talked-about breakout candidates on the men’s side, each carrying recent title runs or signature wins into the summer hard-court swing.

Who are the biggest WTA dark horses heading into the US Open?

Victoria Mboko, Diana Shnaider, and Alex Eala have all shown recent form and title-level results that put them firmly in the conversation for a deep run at the year’s final major.

Has a dark horse won a Grand Slam recently?

Yes, Alexander Zverev won his first major at the 2026 French Open, and Linda Noskova claimed her first Grand Slam title at Wimbledon just weeks later, both outside the sport’s usual favorite circle.

What makes a player a genuine dark horse rather than just a low seed?

A genuine dark horse usually has a recent title or a signature win over a top player, showing that their results are current and repeatable rather than an isolated surprise.