Stream Sans Battle - Stronger Than You (Undertale Animation) by Danian Calkins

Pixilart - Grape Sans Battle Sprite by Undertale-Freak

Sans, All Fiction Battles Wiki

Alternate Sans Battle

Necho!ALTERTALE - Sans Fight Mockup] by NechosCoolDumpster on DeviantArt

Sans battle 癿控 - Illustrations ART street

Mad!Sans battle sprite by JEgames11 on Newgrounds

Undertale: Sans Fight · lovelyladyartist · Online Store Powered by Storenvy

UNDERTALE - SANS FIGHT! by mikey35 -- Fur Affinity [dot] net

Gotten to the halfway point in the Sans fight and somehow megalovania seem to start playing after I took the screen shot even when it's not at this point in the fight.

Undertale Sans Fight Easy - Colaboratory