Preston Stout is the number one ranked amateur entering the week, with Englishman Tyler Weaver in second spot, followed by American duo Tyler Watts and Miles Russell in third and fourth respectively. The only player to win the US Amateur while ranked No.1 entering the weekSince the amateur world rankings began in 2007, just one player has managed to win the US Amateur while ranked as the world number one. Peter Uihlein entered the 2010 US Amateur at Chambers Bay ranked as the No.1 player. Photo by Jason Butler/Getty ImagesAnd he is the only number one amateur to win the championship, after he beat David Chung 4&2 in the final. There is obviously a huge amount of pressure on whichever player is ranked as the world number one heading into the US Amateur.