There's no shame in going 6 rounds with Jamal Woods who also took Robert Alfonso, Trevor Bryan, George Arias, lost a to Eric Molina by MD and arguably beat Taishan Dong. Sirenko got some solid rounds in.
I am very impressed with Sirenko, you can hear his punches land, he is very powerful........................he will become a champion in the future....................hell, I would bet on him to knock Wilder out right now and he has just started his pro career!
The guy who uploaded this video (Sirenko vs Woods, round 1) said Vlad was tasked not to rush things too much and to work combinations body/head.
Yeah, well he had 6 rounds of feeling out a journeyman with 6 ko losses on his sheet. At least he should have no problem getting another fight.