The man who pulled Shohei Ohtani‘s 50th home run ball from a scrum in the stands of LoanDepot Park on Thursday afternoon is about to be a whole lot richer … ’cause, according to auction experts, the keepsake is worth a small fortune.

David Kohler and the guys over at SCP tell TMZ Sports … based on their initial evaluations — the baseball that Ohtani socked over the left field wall during the Dodgers’ blowout win over the Marlins will likely sell for over $300,000 on an auction block.

While a hefty price tag for sure, the piece appears to be worth every penny … as it’s truly one-of-a-kind.

It marked the first time in baseball history that someone has recorded 50 home runs and 50 stolen bases in a single season. It also was part of a game that some are calling the greatest ever played — as Ohtani finished the day with six total hits, three home runs, four runs scored, 10 runs batted in and two steals.

As for the owner of the ball — they’ve yet to be publicly identified — but a witness at the stadium told cllct on Friday he’s believed to be in his 50s.

Reportedly, the guy went through negotiations with the Dodgers after securing the ball … but he ultimately left the stadium with it in his possession.