It’s been a joyous century for Boston sports fans. Our four pro sports juggernauts have combined to win seven championships in Century 21, leading to so many wild and festive celebrations that the tires on the duck boats nearly are worn down to baloney skins.

But in terms of being there for the grand finale, of witnessing history, of smiling the cocky smile of the cool kid in class who takes a selfie and then posts and boasts on Facebook, well, that hasn’t happened much.

If the Red Sox dispatch the St. Louis Cardinals tonight at Fenway Park in Game 6 of the World Series, or if they stretch things out and get the job done in Game 7, it will mark only the second time during The Great Boston Sports Championship Run that the champagne has been spilled on native soil.

It also will be the first time the Sox have won a World Series at Fenway Park since . . . 1918.

(And you thought we put that year in mothballs.)

Of the seven combined championships won this century by the Patriots, Red Sox, Celtics and Bruins, only the Celts have taken care of business at home. The date was June 17, 2008, and the Celts, led by their Big Three: The Sequel, wiped the Lakers right off the Garden parquet, claiming a 131-92 victory in Game 6 of the NBA Finals.

Causeway Street turned into Bourbon Street at the height of Mardi Gras, Times Square on New Year’s Eve, the Esplanade on the Fourth of July. Crazy. And for the most part, fun crazy.

And that’s been that. Our teams otherwise have been road warriors.

The Patriots, of course, earned their championship hardware at neutral-site Super Bowls, because that’s the way the National Football League runs its shop.

When the Bruins snuffed out the Canucks in Game 7 of the Stanley Cup finals in June 2011, Tim Thomas stopping everything but time itself, the deed was done at Vancouver’s Rogers Arena. (After which liquored-up Canucks fans kept faith with a longstanding Vancouver tradition by setting things on fire.)

The Red Sox?

In 2004, when they won their first World Series in 86 years, it was at the old, since-demolished Busch Stadium II. Emotional Sox players made sure the great Johnny Pesky was among the first to hold The Trophy With the Little Flags. It was at old Sportsman’s Park in St. Louis, back in 1946, that the Sox lost to the Cards in seven games, with Enos “Country” Slaughter scoring the deciding run after Pesky was said to have “held the ball,” so maybe it was just as well the Sox won it in St. Louis. It was a happy return visit for Johnny, and a moment he embraced for the rest of his years.

But the Red Sox won the 2007 World Series with equal dispatch, sweeping the upstart Colorado Rockies in four games. Game 1 was a romp, with Rookie of the Year Dustin Pedroia jumping on a Jeff Francis pitch for a home run in his first career World Series at-bat. When the Fall Classic moved to Denver for Game 3 and a Coors Field security guard tried to stop the diminutive second baseman from getting through the gates, Pedroia said, “Why don’t you ask Jeff Francis who I am?”

For that incident alone, it’s just as well the Sox won it on the road. And once again, Fenway Park remained longing for a World Series celebration.

That all can change tonight in Game 6.

Or perhaps tomorrow night in Game 7.