The fan who caught Shohei Ohtani‘s historic 176th home run is about to be a whole lot richer … TMZ Sports has learned the man’s putting the ball up for auction — and it’s expected to net him a small fortune!!

The guys over at Heritage Auctions tell us … Jason Patino — who snagged the record-setting baseball after Ohtani blasted it toward him in an April 21 victory over the Mets — is selling the memento on their block, and they’re figuring it’ll eventually go for around $200,000.

The ball, of course, holds a ton of value … as it marked the official breaking of Hideki Matsui‘s MLB record for dingers by a Japanese-𝐛𝐨𝐫𝐧 slugger.

As for the ball itself, check it out … it’s pretty sweet. It’s got official MLB logos all over it, along with a holographic authentication sticker. It’s also got a handwritten “E” on it.

Getty

Some might be wondering why Patino would give up such a gem, especially when, initially, he said he would keep it. Well, we’re told the potential six-figure price tag made things simply too hard for the man to hang onto it any longer.

Getty

Bidding officially opens on August 23 … good luck!!