Ghana overcame South Korea in a five-goal thriller to keep their round of 16 hopes alive following a 3-2 victory at the Education City stadium.
Mohammed Salisu opened the scoring against the run of play midway through the first half.
South Korea fought back with two daring Cho Gue-sung headers three minutes apart to level the seesaw match.
Kudus grabbed the winner in the 68th minute when he was left unmarked in the penalty area and slotted home past a diving Kim Seung-gyu.
Ghana now join Portugal at the top of the group standings on three points with Uruguay and South Korea on one.
