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What happened in 2011?
Entering the 2011 season, Kaymer turned down a chance to become a full PGA Tour member.
What did he do instead?
He stated he would concentrate on the European Tour for 2011, but would play several U.S.
events as well.
Which tournaments did he play in Europe?
WGC-Accenture Match Play Championship.
Which tournaments did he win in 2011?
In January, Kaymer claimed his third Abu Dhabi HSBC Golf Championship title.
Did he have any problems in 2011?
CANNOTANSWER.
How did he become the number one ranked palyer?
Kaymer overtook Lee Westwood as the number one golfer in the world.
Are there any other interesting aspects about this article?
After reaching the number one ranking, Kaymer decided to undergo a swing change to be able to move the ball both ways.

Question: Did this work?
Self-contained rewrite: Did Kaymer's undergoing a swing change work?