MyBaseballStats is an app for specifically baseball stats, score inputs. No need bother sign-up!
Simple interface which allows you to record required scores.
Recorded score will be shown in a ranking. It will be able to compare the stats within the team and league.
Japanese and English version are available to use.

This application is subject to the Apple Standard End User License Agreement: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/