Amazing Grace and Chuck (1987) on Netflix

Plot summary

Chuck Murdock pitches for his Little League team in Montana and is the son of a military jet pilot. A school trip to a weapons site leaves him anxious about nuclear war, and he refuses to play baseball until nuclear weapons are gone, which forfeits a game for his team. A newspaper blurb about the boy reaches "Amazing Grace" Smith, a Boston Celtics player, who says he will not play professional basketball again until the weapons are disarmed. Athletes around the world follow. Smith moves to Montana and buys an old barn that he and the others fix up as a place to live. His agent, Lynn Taylor, is unsure of his aim but backs him and Chuck. Pressure builds against them, with physical harm and economic threats.