Gallagher reached as high as 14th in the World Amateur Golf Ranking.
Top fifty golfers in World Amateur Golf Ranking.
He also became the number one world amateur golfer according to the R&A World Amateur Golf Ranking.
He was awarded the Haskins Award in 2006 and featured in the top ten of the World Amateur Golf Ranking.
The win moved him into 14th in the Official World Golf Ranking, his highest ranking to date.
He played for the national side from 2006 onwards, and was ranked as high as 14th in the World Amateur Golf Rankings.
On March 23, 2011 he become world number 1 in the World Amateur Golf Ranking.
It is a 72-hole scratch stroke play competition, and is classified as a Category A event by the World Amateur Golf Rankings.
Drawn from the Official World Golf Rankings of 4 July 2010 (provide the player was entered in the Open and did not withdraw from qualifying):
In August 2012, Matsuyama reached number one in the World Amateur Golf Ranking.