Very disappointed by Del Potro's tactics, even as a Nadal fan, not that I'm unhappy about an unpredictably straightforward day at the office. I can forgive the lack of energy (that seems to be a DP trademark), unforced errors, poor execution, and even the harmless backhand (the biggest problem in his game since his 2010 injury, and the reason this match-up has become so difficult for him on almost every surface), but I can't forgive his insistence on standing miles behind the baseline to return Nadal's serve, which put him on the back-foot in every rally, despite Nadal's serve being an absolute joke this tournament in terms of pace, precision and placement.
Del Potro always stood back to return Nadal's serve throughout his career, to mixed results, but the idea was that Nadal almost never got cheap points against him. On clay, with Del Potro's backhand being completely unable to cause Nadal trouble or get DP on the ascension in the rally, this is just a terrible idea because it just allows Nadal not to be under any sort of pressure to go for more on his serves, knowing he'll just get to hit a forehand on the first shot of the rally and take it from there.
Nadal was not at all impressive in the first set and the serve and backhand continue to be a problem, and perhaps more importantly, his nerves. To his credit, he navigated through his first set problems very smartly by using the drop shot more so than I've seen him use it at any point in a given set (throughout his career really), further exploiting DelPo's ill-advised court positioning. However, I really feel this was also to compensate for Rafa's lack of confidence in actually hitting through his forehand and going for his shots. A telling point in which he served and volleyed on a second serve, (which worked, because he's a problem-solver) is further evidence.
That said, he raised his level in the second and third sets and played very well, serving aside. But, with news of rain on Sunday, and Rafa's patchy level, the final is not a foregone conclusion, especially against Thiem.