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AFC Champions League
Second half substitute Hernandez turned the game in Incheon United’s favour as the Brazilian came off the bench to score twice in the final 15 minutes to earn the debutants from Korea Republic a 4-2 win.
The result is an early blow for Japanese champions F. Marinos, with head coach Muscat having targeted an extended run in the competition.
#ACL - Group G | Yokohama F. Marinos (JPN) 2 - 4 Incheon United FC (KOR)
A "bitterly disappointed" Muscat said his team had made things far too easy for the visitors.
"When you concede four goals at home, it overrides everything else in the performance," Muscat said.
"I think nearly every time they attacked, they scored against us. It's something that needs to improve, and quickly."
The defeat was a continuation of F. Marinos' recent struggles, with their inconsistent league form seeing them trailing leaders Vissel Kobe by a point heading into the final stretch of the J1 League season.
For Incheon United, it was a dream debut and the Korea Republic side will aim for another three points when they host Kaya FC-Iloilo of the Philippines on October 3 with F. Marinos facing China PR's Shandong Taishan.
Shandong defeated Kaya FC 3-1 on Tuesday.
