Also...another thing that usually gets forgotten is that tennis scoring exagerates differences.
If one were to win only 50% of all points played, and therefore be considered "equal" with their opponent in any other more simple scoring structure, one could still win the set 6-0.
So, getting bageled doesnt always mean that the opponent was many many times better. It can mean that the opponent just won the "correct" points. We all know that, in tennis, all points are not created equal.