For Murata, who spent a month in US, his training camp was focused on improving ahead of his bout with Brazilian puncher Carlos Nascimento (29-3, 23). As part of this he spent time sparring with American Mike Jones and getting used to punching with Cleto Reyes gloves, the Mexican made "puncher's gloves".
For Yamanaka the experience in the US was his first training camp there though one that seems to have been used to get used to conditions in the US before making his US debut later this year. As well as adapting to the conditions Yamanaka also improved the way he threw his right hook, possibly a key addition to his strong over-all game.
Whilst we know when Murata will return to action, February 22nd, we're unsure on the specifics of Yamanaka's return though we are expecting an announcement any day soon. We know it will be in April, in the Kansai region and that he will be defending his WBC world title, though no opponent or date has yet to be confirmed.