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The fight is scheduled to take place at the Kyoto Arena.
Yamanaka (24-0-2, 17 KO), known as "God's Left," first won his belt by knocking out Christian Esquivel in 2011 and has turned away all subsequent challengers, six of them via knockout. His reign includes wins over Vic Darchinyan, Suriyan Sor Rungvisai, and Anselmo Moreno, though the Moreno victory was not without controversy.
Our own Scott Christ ranked Solis (23-3-1, 10 KO) tenth in his 2015 Year in Review. The Venezuelan picked up wins over Kohei Kono and Daiki Kameda during his time at 115, but has been content to pad his record since moving up in weight. He fought a man who hasn't won since 2006 in November, making this a rather dramatic rise in competition.
Seems like a decent title defense on paper. Any complaints?