The monthly MVP awards for the month of May were announced by the Central League officials on Tuesday.
Colby Lewis was named the monthly MVP in the category for pitchers, and Yomiuri Giants left fielder Alex Ramirez was named that for position players.
Colby Lewis won four of his six starts, and had a 1.60 ERA in May.
Alex Ramirez received the honor for the six times in his career.
The prize money is no more than 300,000 yen ($2,857).