Gold edged lower on Wednesday, extending its losses to a third day, as the euphoria over a Greek debt deal fizzled and investors shifted their focus to US negotiations to avert a looming fiscal disaster in the world's largest economy. Spot gold inched down 0.3 percent to $1,737.14 an ounce by 0626 GMT. US gold also lost 0.3 percent, to $1,737.60.