Wigan boss Steve Bruce saluted his January signings after Charles N'Zogbia and Ben Watson teamed up to fire Sunderland into relegation trouble.
The former Newcastle midfielder N'Zogbia applied the finishing touch with a winner in first-half injury-time after Watson had opened the scoring at the Stadium of Light with just 12 minutes gone.
Bruce, who drafted the pair in after losing Emile Heskey and Wilson Palacios during the transfer window, said: "To come here and the way we have played delighted me, and the two new boys - it can only do them the world of good."
He added: "I don't think anyone has ever questioned Charles' ability. He is 22 years of age - I remember him scoring a wonder goal here a couple of years ago for Newcastle.
"I never thought I would have the chance of signing him, but there you go, that's how football works.
"He has great ability. To go the length of the pitch in the Premier League is terrific. It was a great goal.
"We are delighted because you can't go, a club like ours - or any club, for that matter - six or seven weeks without getting a victory in this division. Even though the old spiel comes out that we have played some big teams over the last few weeks and been a bit unfortunate, you need to win.
"In my opinion, a club like ours always needs 10 wins - we have got there and that's our first call."
Sunderland manager Ricky Sbragia, whose side now sit just three points above the drop zone, said: "It's probably, while I have been in charge, the worst we have played as a team.
"It would have been nice to have got something, but even when we were sitting reasonably pretty four or five weeks ago, I always thought we were still in there, to be quite honest with you, because teams are capable of beating each other."
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