For :
This could be a difficult choice actually. Most of big favourites for medal have their events the day after opening ceremony. By form Apurvi Chandela, Saurabh Chaudhary, Mirabhai Chanu all seem to be placed well but competing next day doesn't help the cause.
Even badminton starts the next day to opening. In such a case a boxer or wrestler may get the chance. For boxing Amith / Mary Kom, the latter with experience has the edge provided she qualifies. . Else Bajrang or Vinesh (wrestling, subject to qualification) . Neeraj Chopra (athletics), Manu Bhaker (shooting) all have a outside chance.