Javier Aguirre won his first game as Japan manager but in a less than impressive 1-0 victory over Jamaica in a friendly on Friday.
Wasteful Japan was comfortably the better side but only reached the scoreboard through an early Nyron Nosworthy own goal on a chilly evening at the Big Swan.
In his first two games in charge last month, Aguirre had lost 2-0 to Uruguay and drew 2-2 with Venezuela. The Asian champions depart on Saturday for Singapore, where they will play Brazil on Tuesday.