Foster via KO. I love Saad but he was far to hittable and that spells disaster against a guy like Foster.
Saad does have a chance, but it's not a great one. He's just too easy to hit, and too willing to let guys beat on him early before coming on strong late. With Foster, the firepower is just too great for Saad to survive. And Saad would have all kinds of problems trying to get past Foster's long, piston jab. Foster TKO 8.
I agree with @Xplosive, Saad's overhand could spoil Foster's night, but it's more likely that Foster's awkward style, jab and lethal power keeps Saad off him. Saad has to walk through fire to get to Foster, but in the end, Saad gets burnt.
LOVE Saad, but this. Foster was too devastating a puncher at light heavy for Saad to make the distance.