Ajax's Mohammed Kudus scored twice in Al Rayyan as Ghana beat South Korea 3-2 in one of the games of the tournament so far.
Kudus' brace came after Southampton defender Mohammed Salisu broke the deadlock for Ghana.
A quickfire brace from Jeonbuk FC striker Cho Gue-Sung levelled the game at 2-2 with half an hour to go, but Kudus' swift reply was enough for Ghana to take all three points.
Ghana sit at the top of Group H for a next few hours after the result, but will move down the table regardless of the result between Portugal and Uruguay.
South Korea sit bottom of the group, needing a win over Uruguay and results to go in their favour to have any chance of progressing to the last 16.
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Story of the match
South Korea started the game on the front foot, but failed to create any meaningful chances.
Despite having seven corners inside the opening 17 minutes, striker Cho was still left isolated up top with a lack of service.
The Taegeuk Warriors' best chance of the first half came when Hwang In-Beom's speculative effort was deflected over the top of the crossbar.
After failing to make their dominance count, South Korea were punished.
Jordan Ayew's threatening in-swinging free kick was not dealt with by the Korean defence.
As the ball landed inside the six yard box, Salisu fired home for his second Ghana goal in just his fifth game.
The goal seemed to catch South Korea off guard, failing to mount any significant threat for the remainder of the half.
10 minutes before the break, Ghana's lead was doubled.
Ayew swung in another dangerous cross, this time finding the run of Kudus.
The Ajax man beat Kim Jin-Su in the air and glanced a header home for his sixth international goal.
The East Asian side looked devoid of any ideas going into the half-time break, seemingly heading for a heavy, tournament ending defeat.
Mallorca's Lee Kang-In was introduced to the field 10 minutes after half time, instantly turning the game on its head.
Lee dispossessed Brighton's Tariq Lamptey inside the final third and floated a delightful cross for Cho to attack.
The striker beat Salisu to the ball and headed home to score his side's first goal of the tournament.
Three minutes later, the Taegeuk Warriors were level.
Son Heung-Min's weighted pass to the byline was met by Kim Jin-Su.
The left back chipped a cross into the six yard box as Cho rose highest to score his second in a matter of minutes.
With all bets off, the game opened up.
Ghana had spent the second half pinned into their own defensive third, but managed to create a rare attack in the 68th minute.
Gideon Mensah's low cross found the unmarked Inaki Williams, with the Athletic Bilbao striker snatching at his chance.
The ball rolled on to the left foot of Kudus who curled a well-taken effort into the far bottom corner, gifting both the lead and momentum back to his side.
Perhaps harshly, South Korea found themselves trailing once again.
Paulo Bento's side threw everything at a stubborn Ghana defence in the hope of salvaging a point.
Kim Jin-Su's late volley was cleared off the line by Leicester's Daniel Amartey in what was South Korea's best chance at levelling the score.
As the Asian side were awarded a corner, referee Anthony Taylor blew for full time, infuriating South Korean boss Bento.
The Portuguese manager confronted the officials on the field, receiving a red card for his efforts.
Taylor's decision handed Ghana their first points of the tournament as the African side move top of Group H.
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Player of the match
Both Lee Kang-In and Cho Gue-Sung had notable impacts on the game, but Mohammed Kudus' two goals were ultimately the difference in today's match.
The 22-year-old scored either side of the break, including netting the winning goal, as well as looking lively when in possession of the ball.
With seven international goals to his name, Kudus is destined to be a future star of Ghanaian football.