Track and field is inherently unpredictable. That is the norm in a sport where the difference between a gold medal and eighth place can be half a second or half a foot.
Two months ago, I wrote a column listing 12 Team USA athletes to watch before the World Championships. Those were essentially a dozen of my picks to make the WC roster and have a good chance to medal in Daegu, South Korea, from Aug. 27 to Sept. 4.
Today, three of those original 12 aren't even going to the World Championships. And of the 25 athletes listed in this column, 11 weren't on Team USA during the last WC meet two years ago.
For athletes in the U.S. and worldwide, everything they've done this year is aimed at Daegu. Every time a star skips a meet, every strategy used to combat an injury, every time and distance recorded, it's part of each individual's plan to pace themselves to turn in a peak performance at the World Championships.
Without a WC medal to show for it, an undefeated outdoor season or world No. 1 ranking can be deemed meaningless. This is one of the two track meets (including the Olympics) at which legacies are made.
Now that we know who's competing, here are 25 Team USA athletes to watch at the World Championships: