Tickets for the first US grand prix in Austin later this year appear to be selling exceedingly well.
The local American Statesman newspaper is reporting that the Circuit of the Americas organisation is considering adding more grandstands due to the unexpectedly high demand.
"We have experienced incredible demand for reserved grandstand seating tickets, and customers have quickly purchased our available inventory," public relations vice-president Julie Loignon confirmed.
She said most of the tickets that went on sale a week ago have been sold.
The first US grand prix since 2007 is scheduled for mid November.