Which type of berry seedling is this?

[swincher]

I doubt they are strawberry, which I believe start with serrated cotyledons as well as fuzzy stems. At least the first true leaves are, but I believe the leaf at the bottom left here is cotyledon:

Identifying a volunteer strawberry before it fruits?

Found another strawberry volunteer in the corner of another plant’s pot in the greenhouse. I wasn’t growing strawberries, but birds visited the ground cherries and grape tomatoes in the garden (leaving plenty of little gifts), and I used some of the garden soil in this potting mix. I’ll have to look around and see if any immediate neighbors have strawberries, but I don’t think so. They are a pretty common sight around town, though. [PXL_20220320_030651243]

So my bet would be blueberry, just by process of elimination (though I’ve never grown blueberries from seed).