ST ANDREWS, Scotland, July 20 (Reuters) - Factbox on American Zach Johnson, 39, who won the British Open on Monday following a four-hole playoff with South African Louis Oosthuizen and Australian Marc Leishman. * Second major victory, after 2007 U.S. Masters, comes in his 45th appearance in a 'Big Four' event * Surpasses previous best British Open result of tied sixth in 2013. * Eighth top-10 finish in majors * Has won 12 PGA tour titles * Played in 2006, 2010, 2012 and 2014 Ryder Cups * Third successive American victory in 2015 majors following Jordan Spieth's wins at the U.S. Masters and ... More...