He got him tight with the leg. And he is down. No. Let me stand. Get me up. Just get him out. Just get him out. That was a clip from the new movie, "42," telling the story of jackie robinson breaking... See More
He got him tight with the leg. And he is down. No. Let me stand. Get me up. Just get him out. Just get him out. That was a clip from the new movie, "42," telling the story of jackie robinson breaking baseball's color barrier. Tomorrow, all major league players ear robinson's number in tribute. But there's only one player that wears 42 in every game. Yankee legend mariano rivera. We caught up with him at yankee stadium earlier this week. Just a perfectly executed pitch. You are the last major league baseball player that will ever wear the number 42. Yes. I have the privilege to be the last one. What does tt mean to you? It's not only a privilege, and satisfaction. I accept the challenge, to carry what mr. Jackie robinson represented and what he did. And the legacy he has for us. He left for us, as a minority. I come from panama. And to be the last one to wear number 42, I think it's a lot of pressure in there. I have tried my best and tried to keep the civility and do my job well. You do all right. I try. I try. And now, you've got every stadium in major league baseball, number 42 is out there, retired. Yes. Yes, it is. And you've got it on your back. The only one. The only one. I got it on my back. I'll get you straightened out tomorrow. Okay? It's okay. Are you going to see the movie? Oh, yeah. Faced so much, so much adversity. You know, some of his own teammates -- most of them wouldn't shake his hand when he came on the field. Can you imagine that? I can't imagine that. I can't see that now. I can't. It took a man like mr. Jackie robinson to break that barrier. And thank god for him. I mean, we enjoy this moment now because of him. I always think of him, in the old footage, seeing him play, stealing home, which he did ten times. I was joking about that play. Oh, mariano, he was out. They called him safe. Before you go, I do have a favor I want to ask. Okay. You have the most famous, most effective pitch, in the history of the league. I want to know, how do you throw the rivera cutter? I won't tell anybody. You can just tell me. It's four seams. You grab it more like this. And that's it. All I have to do is grab the ball like that? Just like that. You throw like that, and it cuts. You throw it like that. I will throw it like this. Wait. Why are you throwing it like that? Because I'm mariano rivera. You throw like that. I will throw like this. That's the way it works. I won't give you my tips. You won't give me -- and george will is back with us now. George, you have a rare photograph of jackie robinson, stepping on to the field, moments -- a couple of hours before his first game. That moment was big, not just for baseball. This was way beyd baseball. Jackie robinson is the second-most important african-american in our history. April 15, 1947, was the most important day in the protracted slow-motion emancipation of african-americans since the civil war. Jackie robinson refused to put the fire that was fanned by martin luther king, who was 18 years old, on that day when jackie robinson took the field. And by the way, he took the field 3 years after he, 11 years, 1944, before rosa parks refused to go to the back of the bus. Jackie robinson was a lieutenant in the army, was court-martialed for refusing to go to the back of the bus in ft. Hood, texas, and won his case. Wow. And he was also a great baseball player. How great? First of all, he was on a field, what african-americans were discouraged from being in life, confident, aristocratic. Four-start athlete, four-sport athlete at ucla. Football records. Ncaa champion broad jumper. Led the pacific coast in basketball shooting. And he didn't get to the big leagues until he was 28. Wow. George will, thank you very much. And now, we honor our fellow americans who serve and sacrifice. This week, the pentagon released the names of three soldiers killed in afghanistan. That's all for today. Thank you for sharing part of your sunday with us. Check out "world news" with david muir tonight. And don't miss our web extra. I'll be answering your questions. Plus, my interview with yankees slugger robinson cano on the man he is named for, jackie robinson. It's on abcnews.Com/thisweek. George is back next week. We hope you will be, too.
This transcript has been automatically generated and may not be 100% accurate.