Vasiliy Lomachenko felt his comprehensive points win over Luke Campbell was only a seven-out-of-10 performance.
The masterful Ukrainian added the vacant WBC belt to his WBO and WBA titles as he prevailed at the O2 Arena by margins of 109-108 (twice) and 118-109.
Campbell dug in to hear the final bell, having been put down by a brutal body assault in round 11, as Lomachenko worked through his dazzling repertoire on Saturday.
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But the three-weight world champion, who was driven on by his animated father and trainer Anatoly throughout, feels there is plenty of room for improvement.
"I want to see my fight on the TV and after I will understand what happened in this fight," Lomachenko told a post-fight news conference as Campbell underwent precautionary checks in hospital.
"I think if we took a score out of 10, it would be maybe seven."
Campbell impressed during the opening two rounds, intelligently using his height and reach advantages.
Although he would fall short, as he did in his first world-title bid versus Jorge Linares two years ago, the Hull southpaw ensured pre-fight respect from his fellow Olympic gold medalist was in no way misplaced.
Congratulations @VasylLomachenko
— Matchroom Boxing (@MatchroomBoxing) August 31, 2019
@luke11campbell will come again #LomaCampbell pic.twitter.com/KDPrp5ZwJG
"I said before it wouldn't be easy for me," Lomachenko added.
"He's very smart, he's technical, he has reach — that's his main weapon.
"I was too close (to the knockout), but it doesn't matter. What matters is just to win.
"He has very big power and a good couple of shots he got me good, yeah. I wasn't hurt. He hit me but I wasn't hurt."
Lomachenko now wants to complete the set of major titles at lightweight, although he acknowledges IBF champion Richard Commey's expected showing with Teofimo Lopez means he will probably have to bide his time.
"Of course, I want the last title, IBF. But I don't think it will be this year in the next fight," the 31-year-old said.