Reunion Island but no USA yet on 10m WSPR

FR1GZ (9724km) on Reunion Island in the south Indian Ocean has spotted me many times this afternoon, but not a single spot, well not yet, by a station in the USA.  By this time yesterday a lot of USA stations had spotted me. This is the magic of 10m - you can never be quite sure. Although FR1GZ was probably just F2 , it is possible this was a combination of Es and F2?