By Tony Jimenez TROON, Scotland, July 12 (Reuters) - European Ryder Cup hero Graeme McDowell goes into this week's 145th British Open looking to make amends for the day he let victory "slip through his fingers" in the 2012 edition at Royal Lytham. The Northern Irishman was in the thick of things towards the top of the leaderboard with nine holes to go four years ago but had to make do with a share of fifth place behind eventual winner Ernie Els after dropping four shots on the back nine. McDowell featured in the same final-round group as Adam Scott who dominated the tournament from day one before suffering an agonising late slump that saw the Australian toss away a four-stroke lead over the closing four holes. More...