Baseball has a long regular season, almost twice as many games as pro basketball, and ten times more games than the NFL regular season. Baseball athletes have to play just about every day and sometimes even have to play twice in a day during double-headers. This is why it's essential to keep up on injuries. In football, if a starting quarterback or star running back is injured and expected to miss a game, that injury will be reflected in the betting line.   NFL QBs Tom Manning and Drew Brees might be a 10-point home favorite over a below-average team, but…