The rapper tweeted the trailer, writing: "Sneak peek of some new stuff I've been working on in the @SouthPawMovie trailer. World premiere!"
The two-and-a-half minute clip opens with Gyllenhaal's understatement: "I expected a hard fight. I put my family through a lot."
We then see him in the ring bloodied and bruised as he takes a relentless pounding from an opponent, while his wife, played by Rachel McAdam and Curtis "50 Cent" Jackson look on in horror, before Hope suddenly turns it around sends the other boxer to the canvass.
We then hear the reason Gyllenhaal allowed himself to take the beating in the first place: "The more you get hit the harder you fight, I get it," his wife says. "Only now you've taken way to many hits before you get off. You cant fight like that any more. Think about her."
She's talking about the couple's only daughter Leila, who is played by film newcomer Oona Laurence. The youngster is fresh from lauded performances on Broadway as Matilda in the stage adaptation of the Roald Dahl classic.
But the trailer also reveals there's a much more devastating blow in store for Hope, when his wife is accidentally shot dead by a bodyguard during an altercation with he has with another boxer who had been taunting him, which McAdam's character had told him to walk away from.
And things get worse for the embattled boxer as the child protection services take his daughter away from him after he falls into a dangerous cycle of self destruction following the death of the child's mother.
The film also stars Rita Ora, who recently played Christian Grey's sister in Fifty Shades Of Grey, as well as Forest Whitaker and Naoime Harris, replacing Lupita Nyong'o who dropped out in August.
Gyllenhaal meanwhile went from dropping 30lbs to play the scrawny Louis Bloom in Nightcrawler, to packing on 15lbs of pure muscle to his regular weight to play the ripped boxer.
- Daily Mail
