Sports trades took the prize this past week for the majority of the biggest wins on Polymarket. Numerous traders took advantage of the Spurs in the NBA Finals, but a tennis trade won more money than any other on the platform.
Jakub Mensik Wins Trader Over $1 Million
Polymarket user Inaccuratestake took a chance on a Roland Garros ATP matchup between Jakub Mensik and Andrey Rublev. Inaccuratestake traded $1,146,232.80 on Mensik at 51.1 cents, and it resulted in a $1,096,787.66 win, or a 95.69% profit.
When the market opened, Mensik had a 48.5% chance to win the match. He jumped out to an early 2-0 lead, giving him an 82.5% win probability at his peak, but Rublev battled back and tied the match at two sets apiece.
This is when Inaccuratestake jumped into the market, and Mensik commanded the final set. He took it 6-3, resulting in a massive payday for the trader.
Inaccuratestake is known for significant-sized trades on the platform. This was the user's biggest win ever since joining in March of 2026 for tennis trading.
Their total profit on the platform over 22 trades is $165,204.73.
The Western Conference Finals
There was a wide range of trades involving the Western Conference Finals, including a nearly $1 million win for Polymarket user mooseborzoi. They placed a $1,246,997 trade on the Spurs to win the Western Conference at 45.3 cents, resulting in a payout of $2,103,881.90.
There were multiple chances for traders to hop on the San Antonio Spurs at a fair price because they faced multiple deficits throughout the series.
After jumping out to a 1-0 lead over the Thunder, Oklahoma City responded with two straight wins. San Antonio evened the series at 2-2, but then fell behind 3-2 before prevailing in the final two games.
This user only took one position on the Western Conference Finals, but they have been active throughout the playoffs. They profited $413,000 by taking the 76ers over the Celtics, and then made another $293,000 trading San Antonio over Portland.
An anonymous trader had the third biggest win of the week on Polymarket. They exchanged $1,246,997 for a $2,103,881.90 win on San Antonio.
The Spurs were undervalued for the majority of the series, so there were plenty of opportunities for prime positions.
The Trade Handle Prediction
This week on Polymarket, the big wins category was all about finding value in a market that was undervaluing top talent. Mensik was up 2-0 before blowing his lead to Rublev. However, the energy required to win three straight sets in tennis after falling 2-0 is very high.
Mensik was being traded at nearly 50% of his value at this point, and Inaccuratestake capitalized on the discount, turning their biggest profit ever on Polymarket. The lesson here is a familiar one: markets often overreact to momentum swings, and disciplined traders who trust the underlying matchup can find serious edges. Reading the situation correctly, rather than chasing the scoreboard, is what separated this win from the pack.
The Western Conference Finals were all about opportunity when trading the Spurs. San Antonio never had a lead in the series, so they always carried attractive prices.
We discussed two significant trades on the Spurs, but five of the top ten trades this week involved the Western Conference Finals. San Antonio delivered for multiple users in the market.