When Roger Federer loses to Rafael Nadal, it is an event, albeit not a surprising event.
Certain head-to-head records do not stun tennis fans at all.
When two great players meet, it is often just a matter of how they play on the day, as Andy Murray has previously pointed out to reporters. After all, it would be difficult to imagine the top players completely dominating each other on a regular basis.
On the other hand, there are results that do indeed boggle the mind. When a top player has a genuine difficulty in beating another player routinely who is ranked well below him, that is noteworthy.
Here is a compilation of some of those unexpected results that will surprise any tennis fan.