SAN FRANCISCO (AP) — In a postseason full of twists and turns, the San Francisco Giants are headed back to the World Series after a big comeback against the defending champs.

Hunter Pence got the Giants going with a weird double, Matt Cain pitched his second clincher of October and San Francisco closed out Game 7 of the NL championship series in a driving rainstorm, routing the St. Louis Cardinals 9-0 Monday night. The game ended with the infield a giant mudslide.

San Francisco won its record-tying sixth elimination game of the postseason, completing a lopsided rally from a 3-1 deficit.

"These guys never quit," said manager Bruce Bochte. "They kept going and got it done."

The Giants, who won it all in 2010, will host Justin Verlander, Miguel Cabrera and the Detroit Tigers in Game 1 on Wednesday night.

Verlander is set to pitch Wednesday's opener. Giants manager Bruce Bochy insisted before Monday's game he had not planned any further in advance.

Series MVP Marco Scutaro produced his sixth multihit game of the series and matched an LCS record with 14 hits and Pablo Sandoval drove in a run for his fifth straight game.

After falling behind 3-1 in the series at Busch Stadium, the Giants outscored the wild-card Cardinals 20-1 over the final three games behind stellar starting pitching from Barry Zito, Ryan Vogelsong and Cain.

They also benefited from some strange bounces.

On Pence's double that highlighted a five-run third, his bat broke at the label on impact, then the broken barrel hit the ball twice more. That put a rolling, slicing spin on the ball and caused it to change directions — leaving shortstop Pete Kozma little chance to make the play. Kozma broke to his right, figuring that's where the ball would go, but it instead curved to left-center.

Injured closer Brian Wilson, with that out-of-control bushy black beard, danced in the dugout and fans in the sellout crowd of 43,056 kept twirling their orange rally towels even through rain in the late innings — a downright downpour when Sergio Romo retired Matt Holliday on a popup to Scutaro to end it.

Romo embraced catcher Buster Posey as fireworks went off over McCovey Cove beyond right field.

The NL West champion Giants won their first postseason clincher at home since the 2002 NLCS, also against the Cardinals.

These 2012 Giants have a couple of pretty talented castoffs of their own not so different from that winning combination of 2010 "castoffs and misfits" as Bochy referred to his bunch — with Scutaro right there at the top of the list this time around.

Acquired July 27 from the division rival Colorado Rockies, Scutaro hit .500 (14 for 28) with four RBIs in the NLCS. The 36-year-old journeyman infielder, playing in his second postseason and first since 2006 with Oakland, became the first player in major league history with six multihit games in an LCS.

Now, he's headed to his first World Series.

The Giants have All-Star game MVP Melky Cabrera to thank for helping his teammates secure home-field advantage in the postseason — while Cain was the winning pitcher the National League's 8-0 victory in July. Cabrera was suspended 50 games Aug. 15 for a positive testosterone test, then wasn't added to the roster by the Giants after his suspension ended.