Shohei Ohtani‘s wife couldn’t contain her excitement when the MLB superstar earned the first hit of his Dodger career … cheering on her man from the stands throughout his big debut!!

Mamiko Tanaka — who was recently revealed as the Japanese athlete’s partner — was present for L.A.’s season opener against the San Diego Padres in Seoul, South Korea on Wednesday … and there was plenty to be happy about.

Ohtani logged the first hit of the contest in the third inning … hitting a line drive to right field for a single.

The broadcast quickly cut to Tanaka — à la Taylor Swift at a Kansas City Chiefs game — and she was shouting and clapping with fellow family members and friends as Ohtani reached first base.

The vibes continued in the 8th inning … when Ohtani’s second hit of the night brought home a run.

She was spotted high-fiving with fans decked out in Ohtani merch … and had a huge smile on her face.

The $700 million man ended up going 2-5 from the plate on the day … securing an RBI and a stolen base en route to the Dodgers’ 5-2 win over the division rival.

As we previously reported, Tanaka is quite the sports star in her own right — she played several years of professional basketball in Japan.

It’s clear the Dodger faithful and Ohtani fans are super excited for the two-way athlete’s life off the field … and chances are this won’t be the only time we see Tanaka at the stadium this season.