This Polymarket Bet Turns $100 Into $645 If Bianca Andreescu Comes Back -- She's Only a Set Down

Bianca Andreescu is a former US Open champion playing on home soil this week, and right now Polymarket is paying better than 6-to-1 on her to win this match. She's down a set to a favorite who's been better all match -- but this is a player whose entire career is proof that writing her off early is a mistake, and the market is pricing the scoreboard like it's a verdict. It isn't. Here's the number that stopped me: $100 turns into about $645 if she flips it.

Why this tournament is already a wreck

The National Bank Open -- the Canadian Open, one of the oldest active tournaments on the tennis calendar -- has the women's draw in Toronto this week and the men's in Montreal. And Sunday was chaos. Heavy rain blanketed much of Toronto and shoved the entire women's main draw off schedule. The mess has already swallowed a seven-time Grand Slam champion: Venus Williams fell 6-4, 6-1 to Kamilla Rakhimova in a rain-delayed first-rounder on Sunday.

Meanwhile the home team is delivering. Canada's Kayla Cross, a wildcard on just her third tour match, upset Britain's Katie Boulter to reach the second round, with five Canadians on the York University courts that same day. The building is buzzing. And the biggest Canadian name of her generation is on court right now -- down a set, priced like she's finished.

The market

See the live odds and trade it on Polymarket ->

The trade that made me check the math twice

Bianca Andreescu to win the match is trading around 15.5 cents. Fifteen and a half cents. Here's what that means in real money:

• $100 buys you about 645 shares.
• If she comes back, each share pays $1 -- about $645 back. A $545 profit.
• If she doesn't, the $100 is gone. That's the whole deal.

Better than 6-to-1 on a former Grand Slam champion, in front of her home crowd, on a day the tournament is already chaos. The board carries roughly $478k in liquidity -- deep enough that your entry is a real trade, not a lottery ticket.

Why is nobody watching this?

Because the price is the scoreboard. She's a set down, the favorite has been the better player, so the market shrugs and moves on. But this specific player, in this specific spot, at this specific price, is a story the scoreboard can't tell. Andreescu took the US Open as a teenager -- beating Serena Williams in the final -- and everything since has been one act of proving doubters wrong. The crowd in Toronto knows what that means. The market hasn't priced it.

What makes it win: she finds the level she's famous for, Bartunkova's level dips, and a tiebreak decides a set. What kills it: Bartunkova keeps playing the way she has, closes it out, and the stake goes to zero. You're getting paid 6-to-1 to back the player who has done this before -- against the price of a player who is merely winning so far. That gap is the trade.

The bottom line

A live, liquid Polymarket market is paying better than 6-to-1 on a former US Open champion to flip a one-set hole in front of her home crowd -- and the match is happening right now. $100 becomes about $645 if she pulls it off. The window is open exactly as long as this set is.

See the live odds and trade it on Polymarket ->

Summary

Bianca Andreescu is down a set at the rain-mangled National Bank Open in Toronto, and Polymarket is paying ~6.4-to-1 on her to win. $100 buys ~645 shares; she wins -> ~$645 back (~$545 profit); she loses -> the stake is gone. Live market, odds as of writing.

Disclaimer

This is a trade idea, not financial advice. Prediction markets are volatile and you can lose your entire stake. Odds move and matches resolve quickly; figures are as of the linked sources at the time of writing.

Sources

• Business Insider -- How to watch the 2026 Canadian Open (National Bank Open)
• AP News -- Venus Williams falls in rain-delayed first round at NBO
• Chronicle Journal -- National Bank Open delayed by rain on first day of women's main draw
• Chronicle Journal -- Canada's Kayla Cross upsets Britain's Katie Boulter at NBO
• Polymarket -- Bartunkova vs Andreescu live market