Well said general hercules. This was indeed an upset. I had forgotten about this thread.

Wawrinka used superior tactics to hit those big winners past Novak after set 1. In the first set, he was hitting hard almost all of the time, but a lot right at Novak, and Novak was absorbing the pace and using it to hit harder at Stan, and Stan was missing more when trying to go for a lot.
But after set 1, he varied the pace much better, playing possum type deep central shots without much sting or standard crosscourt back and forth. Then suddenly he would inject pace and blast winners down the line often surprising Djokovic.
The other key was that Novak's first serve was excellent in the first set - something like 78% of them in, and winning 76%, which made it difficult for Stan to break the first set. But his first serve deteriorated quite a bit in the next 3 sets and allowed Stan into the points to do his thing.
1st set: 78% in, winning 76% of those.
2nd set: 61% in, winning 57% of those.
3rd set: 62% in, winning 56% of those.
4th set: 59% in, winning 58% of those.
On the other hand, Stan's serve stats got better after set 1:
1st set: 61% in , winning 75% of those.
2nd set: 70% in , winning 67% of those.
3rd set:
72% in , winning
90% of those.
4th set: 65% in , winning 73% of those.
Respectfully,
masterclass