Jikkyō Powerful Pro Yakyū Portable 4

Jikkyō Powerful Pro Yakyū Portable 4 (実況パワフルプロ野球ポータブル4) is a baseball game which was developed by Diamond Head and published by Konami and released on PlayStation Portable on September 17, 2009 in Japan. It is the fourth game in the MLB Power Pros series for the Sony handheld console.