Prediction markets put the probability at 74%: National Bank Open: Learner Tien vs Gael Monfils. Currently, markets see this as likely (74% YES). Betting Gael Monfils vs.
The second-round matchup at the **National Bank Open: Learner Tien vs Gael Monfils** is set for Wednesday, August 5, 2026, at Stade IGA in Montreal, marking the first career meeting between the two players. The 20-year-old American, seeded **No. 12** and ranked **No. 19** in the world, arrives after a breakout 2026 campaign that included quarterfinal runs at the Australian Open and Madrid, plus a title at the ATP NextGen Finals. Monfils, a 39-year-old wild card, advanced with a late-night win over Kamil Majchrzak on Monday, improving his career tournament record to **25-13** in what he has confirmed will be his **15th and final appearance** in Canada. [National Bank Open, Aug 05]
The stakes are significant for both players, though for different reasons. Tien is part of a deep American contingent — one of four U.S. men in the Top 20 alongside **Taylor Fritz (No. 8)**, **Ben Shelton (No. 10)**, and **Frances Tiafoe (No. 20)** — and a win would further cement his status as a rising force on hard courts. Monfils, a two-time NBO semifinalist (2016, 2019), is playing with the emotional weight of a farewell tour; his victory over Majchrzak was described by the ATP as a vintage performance, drawing on the athleticism that has defined his two-decade career. The Frenchman is also one of only nine players in tournament history with at least **25 wins** at this event. [ATP Tour, Aug 04]
Betting markets have installed Tien as a clear favorite, with the probability of a Tien victory hovering near **74%** as of Wednesday afternoon. The matchup pits Tien’s consistent baseline game and superior ranking against Monfils’ experience and crowd support, though the Frenchman’s first-round form suggests he remains dangerous. The winner will advance to face either **Tommy Paul (No. 17)** or **Valentin Royer** in the third round. Tien’s Masters 1000 breakthrough came at this same event last year in Toronto, where he reached the fourth round, and he has not dropped a set in Montreal this week. [NY Post, Aug 05]
Polymarket prices this at 74c YES with $101K in volume. Moderate liquidity — use limit orders for positions above $1K to avoid moving the price.
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