Summer is finally here, we are almost at that time of the year when things go impulsive & real winners are decided. This week had alot of general sports markets shaping up. Lets take a look!
The week's dominant sports prediction market story was one of the most shocking results in major championship history.
Kalshi's 2026 PGA Championship markets topped $365.2 million in total volume across all categories, with the Outright Winner market alone accounting for nearly $333.5 million making it one of the three largest golf prediction market events ever processed. Aaron Rai won the tournament despite drawing just $8.4 million in outright backing far behind Scottie Scheffler's $20.1 million and Rory McIlroy's $13.7 million. Scheffler generated nearly three times the eventual winner's volume, yet finished tied for 14th at 2-under.
Aaron Rai became the first Englishman to win the PGA Championship since 1919, lifting the Wanamaker Trophy at Aronimink Golf Club in Pennsylvania with a 9-under 271 total
The NBA playoffs produced its most-anticipated Conference Finals bracket in years, with prediction markets pricing every twist in real time.
The OKC Thunder vs San Antonio Spurs Western Conference Finals tipped off Monday May 18, with OKC opening as -260 series favourites and 6.5-point Game 1 favourites. The Thunder defending champions, 64-18 in the regular season had gone 8-0 in the postseason, sweeping the Suns in Round 1 and the Lakers in Round 2, all without second-leading scorer Jalen Williams.
On prediction markets, OKC sat at -165 (approximately 62%) to win the NBA Finals, while the Spurs were at +320 a remarkable rise for a team that began the season as a long shot. The Spurs had hammered Minnesota 139-109 as 5.5-point road favourites in a series-clinching Game 6, confirming their credentials as a genuine championship threat.
Polymarket's Thunder NBA Finals championship market had drawn $16.9 million in total volume the highest of any single-team championship market in this postseason cycle while Shai Gilgeous-Alexander remained the -155 Finals MVP favourite.
Trade Now on PRED - https://www.pred.app/trade/nba-spurs-thunder-2026-05-19-m1779123152102
