The top picture is from the evening's very last event, the prestigious Wanamaker Mile. The second place finisher - Bernard Lagat (purple singlet) - was the favorite since he'd won the race 8 times, but he was topped by Deresse Mekonnen.
The middle photo features another second place finisher - pole vaulter Jenn Suhr. I shot about 50 pole vaulting shots and this one was the sharpest and one of the few where I can see her face. In sports photography, if you can't see the face of the competitor you've failed to convey the emotion of the effort. Her position is perfect: the arms are spread just right and her torso and legs are extended showing the strain of trying to vault over 15 feet.
The third picture shows the emotion I like to convey: triumph! Sara Hall is clearly pleased to be winning the women's 1500 meter run. Again, I moved my camera on a horizontal plane as she ran and I hoped my speed matched hers resulting in a clear photo for the most part. And while her left hand and left lower leg are blurry - her face, with that winning smile, is in perfect focus.