By Andrew Both GREENSBORO, North Carolina (Reuters) - The normally self-effacing Luke Donald carded a six-under 64 at the Wyndham Championship on Saturday, before offering a Ryder Cup sales pitch to European captain Darren Clarke. Donald cannot make the European team automatically, even if he wins on Sunday, so instead will have to rely on earning one of Clarke's three captain's picks. "I think I have the best record in European history as a player," Donald told reporters at Sedgefield Country Club. More...