#1 Cristiano Ronaldo - Real Madrid to Juventus
Breaking all the records not just in Spain, but all over Europe, Ronaldo's future was being questioned ever since the January transfer window last season. However, post world cup, Portugal's all-time top scorer had already decided his fate in terms of looking for a brand new club. Without much by way of a transfer saga, Ronaldo moved on to joining Juventus this very summer.
The best in the world, however, hasn't really been able to do much ever since he arrived in Italy. Given that his biological age, and his play-style is still up to the mark, most people would've liked him to continue his tenure with Real Madrid. Ronaldo has a long career up ahead, and with his fitness-system being more than just consistent even at the age of 33, he has all the tools of a pure world-class player.
Going to a club like Juventus, which undoubtedly is one of the most successful clubs in the world, on the contrary, will limit his talents, and could even force him to change his club.