In the last two games prior to the AO final, Wawrinka went 4-0 in sets vs. Nadal, 3 of 4 were lost in tie-breakers, source:
2013 Barclays ATP World Tour Finals, 7-6(5), 7-6(6) Stats
2013 ATP World Tour Masters 1000 Shanghai 7-6(10), 6-1 Stats
I would argue that a inspired Wawrinka with a "new" game would be in a clear position to take a set (or three) from Nadal. Also, when you look at WHEN the two games above were played (late in the season, close to AO), it is pretty clear that Wawrinka had stepped up his game significantly, and he was making progress.
I view the AO win as a step of progress for Wawrinka.
2013 Barclays ATP World Tour Finals, 7-6(5), 7-6(6) Stats
2013 ATP World Tour Masters 1000 Shanghai 7-6(10), 6-1 Stats
I would argue that a inspired Wawrinka with a "new" game would be in a clear position to take a set (or three) from Nadal. Also, when you look at WHEN the two games above were played (late in the season, close to AO), it is pretty clear that Wawrinka had stepped up his game significantly, and he was making progress.
I view the AO win as a step of progress for Wawrinka.