It can't be easy making Sean "Diddy" Combs cry, but Oscar-nominated documentary film Undefeated did - four times.

"I cried like a baby," the rap mogul, fashion impresario, actor and show business entrepreneur told Reuters.

On its surface, which in this case is the football field, Undefeated is a tale of athletes who mature during their high school football season. But scratch that surface and the movie bleeds the stuff of human drama: overcoming hardship, sacrifice, personal growth, human bonding, love.

Combs, a high school player himself before injury took him off the field and put him on the road to rap music stardom, saw all of that on the screen. And when asked to put his stamp of celebrity on Undefeated as executive producer, he agreed.

Winning his backing is not unlike what happened to 2009's Precious. That movie had screened at festivals and earned critical raves before Oprah Winfrey and Tyler Perry signed on to support it as executive producers and tireless promoters.

Precious, based on the novel Push by Sapphire, went on to earn six Oscar nominations and win two: best supporting actress, Mo'Nique, and screenwriting, Geoffrey Fletcher.

Combs knows his name brings media attention to a documentary that otherwise might not get any. He is quick to say he doesn't need recognition or financial reward. His goal is to get Undefeated seen by audiences because its tale of character building and personal growth is one that should be heard by all.