Who Needs The World Series

As if hitting 56 homers wasn't enough for Aaron Judge's rookie season ... the Yankees star might've hit another outta the park with his smokin' hot rumored GF Jen Flaum.

Judge and Flaum were spotted leaving Nobu in NYC on Monday night ... the first time they've been seen in public since they attended the U.S. Open together earlier last month.

FYI -- Flaum is a recent U. of Michigan grad and a die-hard Yanks fan.

While neither side has confirmed the relationship ... it definitely seems like they're enjoying each other's company.