Saunders, 2-9, could not defend his WBO world middleweight title in October afterwards coming an adverse drug evaluation, inducing him to vacate the name.
He returned to pummel Adamu, 41, with the Ghanaian withdrawn by his corner after 1-2 minutes of their bout.
Elsewhere, Nathan Gorman beat Razvan Cojanu and Tommy Fury won debut.
Saunders transferred into 27 career wins without defeat and also can turn to reconstruct after a frustrating year, at which his team asserts using some”common decongestant nasal spray” generated a failed doping test.
The Briton was not allowed to defend his name in the united states because of a reading returned at a Voluntary Anti-Doping Association (Vada) evaluation.
However he would not have failed a test in britain whilst the substance involved – oxilofrine – is prohibited during an out-of-competition span by UK Anti-Doping.
The 19-year-old boxed reluctantly, landing a solid right uppercut in the very first round because he stalked a competition, who now has 10 3 beats from 116 bouts.
Fury said:”I am learning. When it wasn’t for the excess holding I’d have got him out from there.
“Fight fight I will get far better. Tonight was the start of my journey. I want to be an undisputed world champion. I know it sounds dumb but I mightn’t be in the game differently. I am in no rush but I will get there.”
Gorman v Dubois at 2019?
Heavyweight Gorman, who trains under senior two-weight world champion Ricky Hatton along with Fury, ruled Cojanu and negotiated a height and reach disadvantage.
Romania’s Cojanu – who challenged for a world title in 20 17 – took a heavy upper cut in the fifth round and also the exact same shot has been driven by his guard in the 10th, as Gorman assembled on a good early pace to acquire 119-109 119-109 120-108 on the cards.
“Great win against a huge, solid heavy weight,” tweeted Gorman. “Great rounds under my belt.”
Gorman, 22, today has 15 wins from 15 outings and could be transferred towards a gathering with fellow Briton Daniel Dubois at 2019.