By Tony Jimenez GULLANE, Scotland, July 17 (Reuters) - Former world number one Luke Donald has predicted a great British Open championship this week on a rock-hard Muirfield layout that will favour the more experienced performers. The 35-year-old Englishman, still craving his first major victory, is taking inspiration from the breakthrough wins by Adam Scott at the U.S. Masters in April and Justin Rose at last month's U.S. Open. ... More...