Pongsaklek was in control throughout the 12-round bout at Ariake Colosseum on Saturday and punished the 23-year-old Kameda with a series of uppercuts, USA Today reported.
Two judges scored the bout 116-112 and 115-112 in favor of Pongsaklek, while a third had it a draw.
The 32-year-old Pongsaklek improved to 75-3-1 with 39 knockouts. Kameda, making the first defense of a title he won in November, fell to 22-1-0.
"He had bad manners but he had raw fighting spirit," Pongsaklek told Japanese media. "This time his manners were good but he had no heart."
"I have faith in my technique," he added.
"I have a lot of experience. I just told myself to keep calm and move forward and I got into my rhythm quickly."
23-year-old Kameda refused to talk to reporters, but his father and former cornerman Shiro Kameda, fumed with rage, Fightnews.com reported.
"The judges were a joke!" he shouted as he threw a metal chair against the closed door of the locker room. "The scoring was ridiculous."
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