The Sensex opened marginally lower at 10,738, down six points. After slipping a bit in early trades the index bounced into the positive zone to touch a high of 10,778.The index could not hold gains and slipped back into the negative zone to a low of 10,646 - down 131 points from the day's high.The index, however, rebounded in late deals helped by Fitch upgrading India's rating to investment grade. The Sensex finally finished on a flat note at 10,752, up eight points.
