Mirroring the weak global trends the Sensex looks all set to open on a negative note. However, given the underlying strength in our markets the index may bounce at close.As been reported earlier, the index is likely to find strong support around 13,500, only a break of this level could trigger further weakness in the market. The index is likely to face resistance around 13,805-13,815-13,825 levels, while on the downside the index may find support around 13,740-13,730-13,720 levels.