It was because of that it was one of those sporting events that you flip back and forth to while watching something else, kind of of a oh by the way there is a Major Title on the line right now. At first you look at the score and think good for the young kid, he is holding his own with the big dawg and at least keeping it competitive. Then you look back later and see a lot of 6's and 7's on the scorecard and think - this match must be over Federer must take this, until you take a closer look and do some quick math and think "Oh Man this could be one HUGE upset, can this kid actually take down the greatest player of all time...a man who hasn't lost in 41 straight matches at the US Open"
Federer seemed to have some issues with the officiating during the match as there were some questionable calls and rules interpretations that caused him to uncharacteristically vocal and did drop a few "Bombs" and some "Swears". It was nothing like the verbal assault that that Williams sister exploded into thank goodness. His public image is a lot more important then her's.
del Potro managed not only to win but also became the first player to knock off both Federer and Nadal in the same tournament. This can only help his confidence going forward. The 20-year-old del Potro earned $1.6 million for winning the U.S. Open and an additional $250,000 for finishing third in the U.S. Open Series. He also received a Lexus IS convertible automobile. Not a small accomplishment for a 20 year old (although he looks like he is 30 - he is no Greg Oden but he looks well beyond his years)
In any event this was one major upset and one great US Open final.