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Champion Baseball (チャンピオンベースボール) is an arcade baseball game developed by ADK. Sega distributed the game worldwide, and produced an SG-1000 port in 1983. Alpha Denshi also made a sequel, only released in arcades.
Champion Baseball is said to have been a hugely successful arcade game in Japan, even receiving its own dedicated parlours in the country (of the sort first seen with Space Invaders in 1978).
The SG-1000 port, however, was criticized for the slow speed, confuse hit detection (is pratically impossible to known if the ball was hit or the opposite team catched the ball), simplistic graphics (even for the system's limitations) and grating sound effects.