When anyone uses the term solo king, I laugh. Sasuke has lost plenty of times before including one to Sakon when he was butthurt. Yes he basically lost Vote 2 to Naruto because he admitted defeat.
Sasuke is no Solo God/King, only his fanboys who ride him so hard can't see the difference, Itachi is the real one because he hasn't lost once. He had to die of a disease otherwise he would've have won. I only consider him to be the true solo King someone who has never lost in the manga and continues to never lose.