PHOENIX - Opening game isn't just America's pastime but also a family tradition for baseball fans like Dean Stein.
Sixteen years ago, Dean made a pact with his then-7-year-old son Brandon that they would attend every opening game for the Arizona Diamondbacks.
"I had a 7-year-old son who loved baseball," said Dean. "I why don't we do this every year. Between you and me. If you go away to school. you'll fly home. If I'm out of town, on business or whatever, I'll make sure I'm back for opening day."
Dean even pulled Brandon out of school.
"I don't think my teachers probably liked it," said Brandon.
Dean says his love for the game started when he was a kid growing up in Chicago. He and his friends got dropped off in front of Wrigley Field. They waited for hours in the cold weather to buy tickets for the opening game.
"I still love my Cubs but they haven't won me a World Series yet," said Dean.
Their favorite memory was attending the 2001 World Series, when the Diamondbacks beat the New York Yankees.
At each opening game, the father-son team buys a baseball.
Dad keeps the keepsakes on a shelf in his office.