Leave it to Madison Bumgarner to get baseball off to a smashing start.

Before the World Series champion Chicago Cubs took the field and after the New York Yankees lost their sixth straight opener, Bumgarner struck.

The San Francisco ace, known for his dominant pitching in October, provided an opening day jolt by hitting not one, but two home runs Sunday for the Giants.

Not exactly what Henry Sands came to see at Chase Field. After watching his team lose 93 times last season, the Diamondbacks fan — every fan, really — hoped this would be their season.

“It is the beginning of the year, it is baseball again. It is something I have to look forward to, it is home,” Sands said. “The Diamondbacks are tied for the top, then they work their way down. But first is the goal.”

Exactly where the Cubs finished last November, winning a Game 7 thriller in Cleveland to capture their first World Series crown since 1908.

The Cubs opened Sunday night at St. Louis, and fans of the longtime rivals mixed and mingled outside Busch Stadium before the Cardinals rallied for a 4-3 win on Randal Grichuk’s RBI single in the ninth.

Ted Summers and Katie Moll, both from Manchester, Mo., walked hand in hand along the concourse. He wore a Cubs shirt, hers featured St. Louis star Yadier Molina — earlier in the day, the Cardinals catcher added $60 million and three years to his contract.

There were three games Sunday, with all the other teams in action Monday.

San Francisco wound up losing 6-5 at Arizona as new closer Mark Melancon blew a ninth-inning lead.