Priyanka Chopra treated her fans to a teaser from her upcoming film Mary Kom to mark her birthday. Read No screening in Manipur for Mary Kom biopicThe teaser opens with Mary (Priyanka) entering the boxing ring and a few of her punches are shown. The raw energy of the trailer is catching, the gritty portrayal showing another facet of Priyanka the actor.Based on the life of Olympic medal-winning pugilist Mary Kom, the movie is directed by debutant Omung Kumar. Talking about Priyanka portraying her on screen, the boxer had said earlier, "She is a simple and dedicated person. I can relate to her. I’m sure she will do a great job." Mary Kom is slated to hit theatres on September 5.