This isn't to say other sports don't have action (basketball, soccer, etc) or chess like transitional strategy (football), but the scientific wealth of information in baseball is fairly unrivaled because of discrete nature and very calculable states. These qualities make it assaultable mathematically and scientifically in ways other sports that have more flowing nature cannot have done to them.
It's good to see the article give a nod to a cricket bowling study though. Cross-pollination is good. But for mathematics geeks, baseball is the Beautiful Game.