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Like Kotoko’s big January signing Vinicius, Dwarfs’ Japanese acquisition Jindo Morishita was relegated to the bench.
In the ninth minute, Kotoko defender Imoro Ibrahim tested Dwarfs goalkeeper Razak Issah with a shot, six minutes before goalkeeper Razak Abalora was forced into a save by Elia Kofi at the other end.
Habib Mohammed then made another attempt to get the Porcupine Warriors the opening goal but his shot from outside the box missed the target by a whisker.
Dwarfs broke the deadlock in the 25th minute when Korsah smashed a shot from outside the box into the net after a shortish free-kick was rolled onto his path.
Kotoko coach Mariano Barreto made two changes to the starting team that faced Berekum Chelsea last weekend, Emmanuel Sarkodie replacing suspended Fabio Gama Dos Santos and former Atalanta man Patrick Asmah coming in for Augustine Okrah.
Olympics were led by talismanic playmaker Gladson Awako, former Ashanti Gold midfielder James Akaminko and Ghana B duo Samuel Ashie-Quaye and Michael Otou.
Awako drove a shot over the bar in the 20th minute, then Ashie-Quaye, having fended off a challenge from Mudasiru Salifu, sent a low but feeble shot straight into the arms of Kotoko goalkeeper Razak Abalora.
Olympics made another attempt, this time around by Akaminko, who released a low shot off target after finding space. He would also get the first chance of the second half but once again, his shot was off target.