It's Thursday morning and in Louisville it has rained almost an inch since midnight. While the main track probably will be fast both Friday and Saturday, I don't think the turf course can dry out that quickly. There are three grass races carded for tomorrow (all 2YOs) and four more on Saturday. Personally, I'll be looking for horses that like yielding turf and soft footing.
As an aside, I don't think they'll take tomorrow's three races off the turf but they might have the rails up. That would make for an even more complicated puzzle. With the rails up, the turns are tighter and that favors early. But the course will be heavy and more tiring, which favors pressers and closers. Don't you love it?