Gabriel Diallo vs Jaume Munar Best Bet & Prediction, US Open – August 28, 2025
The US Open 2025 men’s singles second round features an intriguing clash of styles as No. 31 seed Gabriel Diallo of Canada takes on Spain’s Jaume Munar in New York. The Canadian giant will look to build on his solid start, while Munar aims to finally break through against an opponent who has had his number in previous encounters.
The winner of this second-round battle will face either fifth seed Jack Draper or Zizou Bergs in the US Open third round. For Diallo, this would mean a first career clash with a top-10 player at a Slam. For Munar, it’s about breaking new ground on hard courts and proving he can compete against the ATP’s rising big hitters.
Head-to-Head Record
This will be the third competitive meeting between Gabriel Diallo and Jaume Munar, with the Canadian holding a 2-0 head-to-head lead. Their most recent encounter came just last year in the US Open first round, where Diallo prevailed in four sets, 6-4, 3-6, 6-3, 7-5.
Earlier this season, Diallo also claimed a 7-5, 6-3 victory on grass courts in Mallorca, underlining the Spaniard’s struggles against his power-heavy game.
For Munar, whose experience is mostly on clay but has historically found hard courts more challenging, this matchup presents both a chance for revenge and a serious test of resilience.
Gabriel Diallo: Canada’s Breakthrough Seed
The 23-year-old Canadian is enjoying a breakthrough season, seeded for the first time at a Grand Slam. Standing at 6ft 8in, Diallo possesses one of the biggest serves on tour and has added consistency to his power game under the guidance of former Canadian Davis Cup captain Martin Laurendeau.
Diallo’s rise into the seeded bracket is also symbolic for Canadian tennis. For the first time in history, Canada has three men’s singles seeds at a US Open – Felix Auger-Aliassime (No. 25), Denis Shapovalov (No. 27), and Diallo himself at No. 31. His breakthrough into the Top 32 not only highlights his rapid development but also underscores the growing depth of Canadian men’s tennis on the Grand Slam stage.
Diallo opened his US Open campaign with a gritty 7-6, 4-6, 7-5, 7-5 victory over veteran Damir Dzumhur. The match showed both his strengths – unplayable serving in key moments – and areas for improvement, as he occasionally struggled to close out sets. Still, his ability to come through pressure situations bodes well for the rounds ahead.
After making his main draw debut last year and falling to Tommy Paul in the third round, Diallo now has an opportunity to go even further than the third round of a Slam for the first time in his young career.
Jaume Munar: Grinding His Way Forward
The Spaniard advanced by defeating Lucky Loser Jaime Faria in four sets, 6-0, 6-3, 5-7, 6-2, marking his first second-round appearance in New York since his debut back in 2018. While Munar looked sharp for most of the match, he did suffer a lapse in the third set before quickly regaining focus.
Munar’s grinding baseline game can frustrate opponents, and his fitness and mental toughness are never in doubt. However, he lacks the natural weapons to dictate play on hard courts, which could again put him at a disadvantage against a big server like Diallo.
Diallo vs Munar Best Bet & Prediction
From a betting perspective, this second-round clash is about as tight as it gets. According to the betting odds at EveryGame, Gabriel Diallo is priced at -118, with Jaume Munar narrowly behind at -111, reflecting just how evenly matched the two players appear on paper. The total games line is set at 39.5, also with -118 odds on either side, hinting at the expectation of a long, competitive contest that could easily stretch to four or even five sets.
Diallo holds the edge in their head-to-head (2-0), and his booming serve on the hard courts of Flushing Meadows is likely to earn him plenty of free points. Munar, however, thrives on dragging opponents into extended baseline exchanges and will look to test the Canadian’s patience over the course of a physically demanding battle.
While Munar has improved his hard-court results recently, Diallo’s superior firepower and ability to control service games make him the more reliable side to back in New York. His serve should give him just enough of an edge to maintain his perfect record against Munar and book a place in the third round.