Something looks to have been troubling Rafael Nadal in 2014. The Spaniard came into the year as world No.1, but rather than dominating the field, it looked as though he was holding onto that title.
It all started in the Australian Open. He got to the final for just the third time and only Stanislas Wawrinka - certainly no Novak Djokovic or Roger Federer - stood in his way. Aside from the odd rough patch, Nadal generally enjoys taking the crown.
A disconcertingly poor clay season then ensued. Warm-up losses in Monte Carlo, Barcelona and Rome were certainly events we aren't used to seeing.
Even in the French Open, where he picked up his ninth crown, Nadal didn't stroll it as gracefully as usual - apart from a humiliation of Andy Murray in the semis.
It doesn't seem right to criticise a 14-time Grand Slam winner, but again at Wimbledon - the former world no.1 didn't seem to have the same air of invincibility as he failed for a third year in a row.
I looked through it, and there are five reasons why I think Rafael Nadal might never win another Grand Slam.