Transcript for Major League Baseball fans celebrate the opening day of the season
��� We are Farmers. Bum-pa-dum, bum-bum-bum-bum ��� Finally tonight, America strong. And the old ballpark. Here is David Wright. Reporter: Like Easter day or passover, opening day is a moveable feast. But to baseball fans, just as sacred. Promising a change of season, and, more than that, fresh hope. That this year, we just might go the distance. That's why Ryan popped the question today under the liberty bell. She's a huge Phillies fan and I felt like it was right. Go, Phillies! Reporter: Baseball is America's national pastime. Opening day full of traditions. Today at nationals park in Washington D.C. The honor went instead to 72-year-old Billie cook, a Vietnam vet. Straight to the ground. Reporter: A perfect pitch right across home plate. Among those who couldn't be there, nasa astronauts. ������������������
This transcript has been automatically generated and may not be 100% accurate.