The midway point of the pro baseball season arrives tonight, with a few elements that make it seem like a contest from long ago. For one thing, the National League is defending a winning streak. And for another, one of the pitchers on the roster tonight is a knuckleballer – but New York Mets pitcher R.A. Dickey won’t be starting for the NL, because of fears that catchers may have problms fielding his knuckleballs.