My pick is Luke Donald as the player who will have the greatest impact for the European Ryder Cup team. Donald is an excellent player especially when it comes to match play. Luke Donald has won a record 7 out of 8 Walker Cup points leading Great Britain and Ireland to victory in '99 and '01. Donald also won the NCAA individual title in '99 while attending NorthWestern University in Chicago.
Luke Donald has won on both the PGA and European Tours. If there is one player I think that could be a thorn in the side of the US, Luke Donald is the guy. Europe is lucky to have him on their team.