YBN Cordae says there isn't much he can do to help his girlfriend, Naomi Osaka, prepare for a big tennis tournament ... other than be a supportive BF, that is.
We got the Maryland-based rapper leaving a Puma Store Friday night in NYC, where he's in town for the U.S. Open -- in which Naomi is competing and defending her championship. She's got a huge match Saturday night against up-and-comer Coco Gauff. Should be good.
Seeing how Naomi's got a lot on the table ... we asked Cordae if he does anything in particular to help her get ready for these high-stakes moments.