My biggest improvement this year was by far my mental approach throughout my rounds. I was thinking this morning about how Tiger called Spieth a "more athletic Jim Furyk" this past week at the Hero in Albany. Both Spieth and Furyk are constantly praised by viewers, announcers, swing coaches, and most importantly fellow tour players for their ability to stay within themselves and playing to their strengths. They never try to overpower a certain course, hole, or shot, but instead they put themselves in position where they know statistically they have the best chance of making birdie.
The cool thing about the #1 player in the world having this approach is that it can be so useful for amateurs to do the same. Sure, it was awesome seeing Tiger pull off feat after amazing feat by doing things most humans could only dream of, but watching Spieth play truly has influenced by own game for the better. I now rarely try to pull off the low-percentage shot or pull out the big dog off the tee when I really don't need it. Playing to your strengths and putting yourself in the most comfortable positions possible will most certainly shave shots off the scorecard.