INDIANAPOLIS -- Under his skull-tight swim cap, you can't really tell much about Michael Phelps' training. But under his Detroit Tigers ball cap, you can see his hair sprouting out like a well-watered houseplant. It's a subtle thing, but it tells us where Phelps is in his preparation for the Beijing Olympics.

"When he gets really serious, that'll be gone," promises Phelps' coach, Bob Bowman.

ConocoPhillips USA Swimming National Championships

Through tomorrow, Indianapolis Today: Katie Hoff and Kate Ziegler swim the 200 free; Michael Phelps shoots for an upset win in the 100 backstroke.