Mario Andretti — NAPA WINERY REOPENS … After Earthquake Wreaks Havoc

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Mario Andretti‘s Napa Valley winery was hit pretty hard by the 6.0 earthquake this weekend — but TMZ Sports has learned the racing legend has already picked up the pieces and reopened his biz! 

FYI — The Andretti Winery is located just 6 miles from the epicenter … and when the shaking started, hundreds of bottles went crashing to the floor. We’re told the place lost about 30 cases in the quake. 

But CEO Joe Andretti tells us … they didn’t sit around and feel sorry for themselves — they cleaned up the winery and yesterday they reopened their doors — “We’re good to go!” 

Additional wineries in the area weren’t so lucky — with some businesses reporting HALF of their wine stock was lost in the quake. 

As for Mario — we’re told in he was in the area during the shaking and later went to the winery to survey the hurt … but he’s since returned home to Pennsylvania where the ground’s a little more stable.