Kawasaki Todoroki Stadium

Hi,
You give no info on where you are leaving from! At any rate, for JR you could get off at Musashi-Kosugi Stn. and from there it is about a 15-20 minute walk to the stadium. You can see regular fares, routes and schedules on Hyperdia. Just plug in your departure and arrival stations.
Under "More Options", be sure to uncheck the Nozomi box since you can't ride that train using the pass.
Also note that if you see any train line in purple, it is not JR and so not covered by the pass.

Good luck.