Prize

Hello @localover and Welcome to the community. I'm assuming that your question is related to Candy Crush Saga bcoz this section is relatively for Friends Saga only. Anyways players don't win any prize or boosters if they rank 1st in their game. It is a feature that has been provided so that a player can compete with his FB friends. This isn't  an event or challenge and hence no prize. 
Happy crushing  !!!!

Hi @localover you are now in the right correct community.  Are you referring to this weekly race?  There are no rewards for this.  It's just an ego thing to let you know where you place in comparison to other players weekly.