Roger Federer chances to world N 1

Here is how Roger Federer can be world number 1 again : 

Fight for number one in february is pretty simple if Federer keeps his decision of not playing till Indian Wells: - Rafael Nadal needs to reach the SFs in Acapulco to stay at 1. If he withdraws or loses before the SFs, Federer comes back to 1 after 5.5 years.