Galatasaray defeated Fenerbahce 3-1, ending Fenerbahce's remarkable 32-game unbeaten run in the Turkish Super Lig, on Saturday evening.
This match signified José Mourinho's first game as Fenerbahce's manager in the Istanbul derby, which culminated in a disappointing loss for the Portuguese coach.
Galatasaray gained an early advantage, with an own goal by Fenerbahce's Dominik Livakovic in the 20th minute.
Dries Mertens then scored another goal in the 28th minute, giving Galatasaray a 2-0 lead at the half.
Galatasaray's Gabriel Davi Gomes netted their third goal in the 59th minute.
While Fenerbahce's Edin Dzeko scored a penalty in the 63rd minute, it was not enough to change the result. Nigerian striker Victor Osimhen provided an outstanding assist in the 28th minute.
Although Osimhen did not score himself, his overall play was crucial to the victory, showcasing his ability to contribute beyond just finding the back of the net.
Osimhen, who joined from Napoli on loan, also provided an assist in his debut match against Çaykur Rizespor last week.
The victory solidified Galatasaray's position at the top of the Super Lig table, while Fenerbahce's hopes of winning the derby were dashed, despite Mourinho's tactical efforts.
Mourinho will likely reflect on his team's defensive vulnerabilities and look to bounce back in the upcoming fixtures.
Osimhen had a total of four shots at goal, one of which hit the target. Before the derby, Mourinho had criticized Osimhen's diving behavior, but the 25-year-old Nigeria international's key assist highlighted Galatasaray's ability to withstand pressure and capitalize on crucial moments.