Blonde will win by KO!
She is more athletic and quicker! She will dismantle the brunette with a lot of hard punches to the body: left-right, left-right, left-right to tummy, ribs, sides, boobs, lower abdomen...............Then she will finish her with a well executed uppercut to the chin! The brunette will fall down to the mat on her back, arms and legs spread aside! The blonde will pose over her defeated opponent's body, planting the right foot btw her breasts!