CHICAGO - One last chance to erase a century of upset. Saturday, the Chicago Cubs will try to win their first playoff game in nine tries as they face elimination.

Cubs fans everywhere will be praying for a win to keep their team in the National League playoffs and preserve their dreams of a World Series title. That's something the Cubs have not been able to do in 100 years. Fans want to end the tradition of bad luck. But some traditions, they say, will never die.

A personality larger than life. You can't miss the Harry Caray statue at the entrance to Wrigley. And fans never forget the music this legendary Cubs sportscaster memorialized. Caray made "Take Me Out to the Ball Game" more than a tradition.

One fan says, "Sometimes can get the team on the right track when they're behind."

This year, that song celebrates its centennial.

Another fan says, "I didn't know it was 100 years old."

From the same box where Caray once crooned, celebrities, athletes, people everyone knows now lead the crowd during the 7th Inning Stretch. Len Kasper, current play-by-play personality, meets them all.

He says, "There's nothing quite like listening to that song here at Wrigley field."

Until recently though, Kasper says a regular fan never really had the chance to perform this fan favorite.

Then came the chance of a lifetime, and TV9 met Dustin Eglseder. He grew up in Guttenberg, with what his family describes as a natural vocal talent.

His mom, Rose, says, "He would just belt it out in the living room, and he was very good."

His sister, Amy, says, "And I was always mad at him, because I wanted to be a good singer, and I wasn't at all."

Only one thing overshadowed that talent.

His sister says, "He's definitely the ultimate Cubs fan."

His love for the team was so strong it helped him battle bone cancer.

Rose says, "It's probably the hardest thing in the world any mother has to do."

Amy adds, "While the game was on, it didn't feel like you're at the hospital. He could focus completely on the Cubs."

During last season, Dustin went through chemotherapy, and the osteosarcoma in his arm went away. Then came a new challenge... a Cubs competition... the Ultimate 7th Inning Stretch - where the winner would take the mic during a game. Dustin entered his version, along with his life story online and let the voting begin.

Amy says, "I don't know a person in Cedar Rapids that hasn't voted for him, that hasn't talked about it. Everybody knows about it."

2,700 other fans had the same idea, but Dustin's story stuck out. He was one of ten who made the final cut and took the field back in Chicago.

His mom says, "It was a dream come true for him."

Dustin started his winning moment with "Alright Cub fans, let's do this for Harry, let me hear you..."

His sister says, "Everybody around me, I'm like, 'That's my brother. That's my brother singing up there."

Rose laughs, "In the end, when Dustin loses his voice and kind of hollers, he used to pause it right there and not let me watch it."

The Eglseders say, since then, they've watched that moment at least a hundred times. About a month later, the cancer came back.

Amy says, "We were just like, 'No, that's not the way it's supposed to be. That's supposed to be kind of like our happy ending, so..."

Dustin started chemo again, and doctors eventually had to amputate his arm. Even that didn't stop it.

Amy says, "He still didn't miss a game."

Over the course of his treatment, the Cubs started a new season, but their ultimate fan was fading fast.

Amy says, "He had started to actually lose his voice, and we knew things were getting pretty close."

Rose adds, "Basically, I feel like, I felt his first heartbeat when he was born and got to feel his last heartbeat when he left."

Kasper says now, he doesn't hear the 7th Inning anthem without thinking of Dustin.

"It's a reminder that life is very fleeting and you should enjoy every moment of it, and I know Dustin did."

And as his song celebrates a milestone, the Cubs also approach a big date. 100 years ago, they won the World Series and haven't done so since. People believe Dustin might be sticking around to see how it all plays out.

Kasper says, "I have a feeling that he's watching from above."

Amy says, "We all know he's up there with Harry Caray and all the others, and we all say he's got the best seat in the house."

The team helped him through his greatest struggle. Now he might just have a hand in its success.

Rose says, "I definitely think they're going to do it. Without a doubt."

Despite the playoff losses, the Cubs earned the best record in the National League this year. Dustin's mom and sister sent TV9 photos of themselves from a few weekends back when the Cubs won the division title. The Cubs' third game in the playoffs, the one that could make or break their season, begins Saturday at 9 p.m. CST.