I drag my baseball and sofball fields on a 5 day schedual and don't have a large problem with weeds. Also during practice and game days I drag them before each game. Keep the transition between grass nd infielf defined. I hard rke it after every game andedge it every 8 weeks.
In the fall I take my core aerator and go over the infield.
We don't use chemical controls on it because of the closenest to wetlands.