A prediction-market trader earned $8.47 million in a single day betting on the FIFA World Cup. The wagers spanned the Sweden-Japan and Ecuador-Germany fixtures. Key TakeawaysA trader netted $8.47 million in a day thanks to bets on the Sweden-Japan and Ecuador-Germany games.The Sweden-Japan match ended 1-1, paying the trader about $4.38 million on a $7.19 million position.World Cup volatility has minted and erased fortunes for many recently, with one trader winning $4.7M and another losing $4.2M just last week.