Yu Darvish -- who's in a $126 MILLION contract -- completed his first minor league rehab start this week ... and celebrated by spoiling BOTH TEAMS with a very expensive Ruth's Chris Steak dinner.
The Chicago Cubs had sent the pitcher down to the Class A affiliate South Bend Cubs to help him work his way back from a triceps injury ... and Monday night, he took the mound with a bunch of guys who make WAY less cash.
In fact, most of the players only make around $45k per year (and that's if they're playing consistently for the entire year).