Marco Antonio Barrera retained his WBC super featherweight title on Saturday by winning a controversial split decision over American Rocky Juarez.
Juarez (left) seems certain to ask Barrera for a re-match
The bout was called a draw but it was announced 15 minutes later that one of the judge's scores had been added up wrong and Barrera had in fact won.
There were no knockdowns, but Juarez rocked Barrera, 32, several times.
The champion suffered a bloodied nose and damaged left eye while Juarez , 25, appeared to be unmarked at the finish.
Duane Ford scored the fight 115-114 for Juarez while Anek Hongtogkham gave Barrera the edge, 115-113.
Ken Morita initially made it even at 114-114 only for his score to be amended to 115-114 in Barrera's favour.
Barrera, from Mexico City, raised his record to 62-4, with 42 knockouts while the defeat made it two losses in a row for Juarez, the 2000 Olympic silver medalist from Houston.
Earlier, compatriot Jorge Rodrigo Barrios wasted little time knocking out Janos Nagy in the first round of their WBO super featherweight bout.