Harambee Stars striker Michael Olunga failed to score again as Kashiwa Reysol registered a straight third loss on Saturday.
Olunga and Reysol were tormented by Kawasaki Fontale at Kawasaki Todoroki Stadium as they lost 3-1.
It was the third match for the J2 League 2019 title winners since the resumption of the Japanese league after losing initial matches to Tokyo FC and Yokohama FC.
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A double from Akihiro Lenaga, in the 40th and in the 42nd minutes, was enough to ensure Kawasaki Frontale went to the half-time break with a clear lead.