Adrian Lam pleased after "ugly win" stretches perfect start
The match was marred by an allegation of a racist remark - read reaction to that here.
Tries by Jackson Hastings, Liam Farrell and Jake Bibby were enough for the hosts to edge a scrappy but entertaining contest which ended Hull's unbeaten start.
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Hide AdLam, whose side have now won five out of five this season, said: "It was an ugly win, but I love the ugly wins. There is a place and time for them during the season and I think it is exactly what we needed considering we have got to play them again in 10 days time.
"I am proud of our boys, they were courageous. The game was stop-start and we coughed up a few errors, but we only had ourselves to blame and we have quite a bit to work on."
The two sides meet in nine days' time in the Challenge Cup.
FC coach Brett Hodgson admitted the best team won as his side suffered their first defeat of the campaign after five games.
He said: "It was a really tight game, we knew what to expect. Wigan just don't go away. The better team won, I have no doubts about that. We weren't clinical enough, but the effort was there."