Ghana gave themselves hope of qualifying for the next round of the FIFA U20 World Cup with an emphatic 4-1 win over the USA, who are now eliminated from the tournament.
The Africans came into the game being unable to make the top two in Group A, but with a big win over the USA, they could be one of the four third-placed sides that go through.
The young Black Stars started brightly with Assifuah and Moses Odjer both going close before Mario Rodriguez wasted a chance at the other end.
Frank Acheampong was denied by Cody Cropper soon after before making an even better save to keep out Lawrence Lartey while lying on the ground.
The opener would finally arrive in the 38th minute when a defensive mix-up allowed Acheampong to pounce and he almost added a second just after the break but was denied by a finger-tip save.
Assifuah was rewarded for his work in the 58th minute though as he worked some space at the edge of the area and rifled a shot into the top corner.
USA were given some hope when Shane O'Neill buried a header into the bottom corner but Assifuah would restore the cushion for Ghana with a header in the 78th minute.
With USA throwing men forward, Kennedy Ashia took advantage with seven minutes to go with a shot through the legs of the goalkeeper from a tight angle to secure the spoils.