Brazilian striker Lucas got the visitors off to a great start with a goal in just the first minute before midfielder Takahiro Futagawa doubled the lead minute before half-time.
The home side attempted gallantly to get themselves back in the match and were given an opportunity when Pedro Junior converted a 70th minute penalty to make it 2-1.
However, Gamba held on for an important victory that sees the join Niigata on 36 points, 11 in arrears of runaway leader Kashima Antlers.
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