While the Boston-based sportsbook is facing a herculean task keeping up with FanDuel, its RedZone deal shows it is nowhere near throwing in the towel. This despite the brutal swathe FanDuel cut through its rivals January 1 to August 15 to become the “most-seen” sportsbook brand on American TV, according to iSpot.tv. The US ad-tracking company last month revealed the Flutter-owned brand’s share of TV ad impressions increased around 40% to 49% year-on-year.