The Mets acquired left-handed pitcher Kaz Ishii from the Los Angeles Dodgers on March 20, 2005 in exchange for Jason Phillips. The Japanese native made his Met debut on April 7 against the Cincinnati Reds, he allowed 5 earned runs over the 6 2/3 innings and was the losing pitcher. He would go on to appear in 19 games for the Mets, 16 as a starter, and posted a 3-9 record with 5.14 ERA. His first win as a Met came on May 28 against the Florida Marlins when he allowed 1 run and 5 hits over 6 2/3 innings.
Following the season, he was released by the Mets and he returned to his native Japan.
While with the Mets Ishii wore number 23.
Kaz Ishii also played for the Los Angeles Dodgers from 2002-2004.