Top Indian pugilists Vijender Singh and MC Mary Kom will vie for glory at the London Olympics today as they play their respective quarterfinal bouts.In the Men's 75-kg category, 2008 Beijing Games Bronze medallist Vijender will face Abbos Atoev of Uzbekistan at 2:30 am (IST) while five-time world champion Mary Kom will clash with Maroua Rahali of Tunisia in the 51 kilogram division at 6:30 pm (IST).In Shooting, Gagan Narang and Sanjeev Rajput are currently competing in the Men's 50-metre Rifle 3 positions event. Narang got India its first medal of the London Olympic as he bagged a bronze in the Men's 10-metre Air Rifle event.In the two-day Men’s trap event, Manavjit Singh Sandhu, who had a disappointing start on Sunday, is trying his luck today.India's Vikas Gowda will be figuring in the Men's Discus Throw event today. The event will take place at 2:30 pm (IST).