US Amateur Champion Colt Knost drives off the 18th at Royal County Down in Walker Cup practice

Northern Ireland teenager Rory McIlroy drives on the ninth tee during a practice round at Royal County Down

Members of the US Walker Cup squad putt on the first green during practice on Tuesday

A red admiral butterfly flutters behind the ninth green at Royal County Down during practice on Tuesday

US Walker Cup team member Webb Simpson drives off the 18th tee at the magnificent Royal Co Down links

US Walker Cup player Rickie Fowler chops out of the rough on the 18th hole in practice at Royal County Down

The splendid view from the ninth tee at Royal County Down on Wednesday

US Walker Cup player Chris Kirk hits a fairway wood on the 18th hole in Wednesday's practice