Milwaukee Brewers lefty Josh Hader has been named National League Reliever of the Month for March and April after a dominating performance.  He struck out eight of the nine batters he faced in two-and-two-thirds innings at Cincinnati Monday.  Hader had an earned run average of one-point-zero-zero in 18 innings of work while fanning 39 batters.  He saved four games and limited the opposition to four hits and a batting average of point-zero-70