The foremost popular US online sportsbook provider is FanDuel. So much so that its market share exceeds that of its two closest competitors put together, but if the business has room for improvement, it would be in its online casino selection. FanDuel should fix problems with its US iGaming offering because, despite having a sizable sports betting market share, it lags behind rivals like BetMGM and DraftKings. Together, those two companies make up over fifty percent of the US online casino market, a share comparable to FanDuel's penetration in the sports betting market.