dogrow

This plugin generate a simple baseball scoreboard. All you have to do is to put shortcode with some game information in your post, widget or fixed page. 
You can customize color in the setting page.

Simple Baseball Scoreboard

Generate baseball scoreboard from shortcode.

zeldink

The Baseball Linescore plugin allows you to add a baseball game’s linescore to your posts, with entries for the teams, the runs each innings, the pitchers who were tagged with decisions, and a link to a full boxscore.

Starcross Baseball Linescore

Adds the ability to add a baseball game's linescore to posts.

Simple Baseball Scoreboard vs Starcross Baseball Linescore