"It's by far the biggest night of my career", said the new world champion, who won five world titles and an Olympic gold medal among a swag of amateur trophies, admitting: "But it was not my best performance".
Remember, it's her seventh professional fight, she's on the verge of winning a world title, the opponent goes down and you'd think she'd have some joy in her face but there was glint in her eye like a shark as if to say "come on, I want to carry on fighting".
She was very accurate, the knockdown was flawless, I would have liked to have seen her go to the body a little bit more with that left hook once she landed it, but ultimately, she's facing a world champion tonight.
"Certainly, we'll be looking at (a homecoming fight)". She strutted into the ring with confidence and started quickly, landing several right hands in the opening two-minute round.
The defending champion lost her title on the scales at Friday's weigh-in having weighed one pound over the 135lb lightweight limit.
At some point, Buatsi might collide with another British fighter around his weight, Frank Buglioni, who kept his British light-heavyweight title with a convincing points win over the unbeaten Craig "Spider" Richards.
As a result, only Taylor can claim the belt with victory tonight after...
Two of Ireland's greatest centre-backs recognising Katie on her fantastic achievement. It's up to her to get the weight off.
She belongs on the same stage as Anthony Joshua.
In the final few rounds, Taylor refused to take her foot off the gas, continuing to shoot home a perfectly-timed and accurate right hand but Sanchez defiantly fought on to hear the final bell.
But throughout the contest Taylor had the edge in power and variety. There were times where she was caught freely by Sanchez. That can only have added to her marketability.
"Usually when I watch women's boxing I think "yeah it's not bad", but this is quality".