Every sporting event (ball game or motor race) that will be counted in that round's scoring is listed in the "Schedule" section of your lineup page. If a game does not appear in that list, it will not be counted!
A round in an NFL tourney will usually include every game played during one week of NFL play.
A round in a NASCAR tourney will usually include only the weekend's Sprint Cup Series race. Races from the other NASCAR series may be added in the future but are not yet available.
A round in a MLB tourney will include either the games played Monday through Thursday OR the games played Friday through Sunday, depending on the cycle used by the MLB tourney you joined. The cycle used by a MLB tourney is usually listed in the tourney's name, such as "MLB-1269 Mon-Thu" or "MLB-1270 Fri-Sun"