Shawn Porter edged Yordenis Ugas by split decision to retain his WBC welterweight title on Saturday.
The American only just managed to hold onto his crown in California, two judges scoring the fight 116-112 and 115-113 in his favour, with the other giving it to Ugas 117-111.
Porter, 31, struggled to make weight and he was below his best against challenger Ugas.
"I think we won the majority of the rounds. I would not have given Ugas very many," he said after his win.
Ugas, the 32-year-old Cuban coming off eight straight wins, rattled Porter and only just fell short of an upset win.
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