KZ8C (6290km) was the first North American to spot my 500mW 10m WSPR today at 1248z. Since then, K9AN (6505km) has also spotted me several times. I think he has a very good RX set-up as he is often copying me on 10m.
I have the feeling there will be a lot of 10m spots today as conditions seem quite good and it is the weekend.
UPDATE 2035z: The last USA station to spot me today on 10m WSPR was KB9AMG (6300km) at 1922z. Quite a decently long opening today.