The quality of 2011 tennis depends on the person that you ask. If you roam the streets of Belgrade surveying random Serbians, I'm pretty sure you'll get a positive answer.
On the other hand, if you have a poll in any Mallorcan city whose inhabitants have seen Rafael Nadal win many grand slams over the years, the answer wouldn't be as great.
It was a normal year; good for some, bad for others.
This article, however, concerns not the four best players but their peers—other fantastic tennis players who have amassed a great amount of ATP ranking points during the last few years.
Whether I predict that the drop will be drastic or whether I believe a certain player will only fall a few spots, the men mentioned in this list will not, in my opinion, have a bright 2012.
But don't worry, because for every drop in ranking there is someone else who rises, so it won't be sad for everybody.
In addition to why I think these players will slip, I will include what their ranking will be on December 31, 2012 (if there is one).