OSAKA — First the good news: As of 4 p.m. Monday, there had been no positive doping tests at the 11th IAAF World Athletics Championships.

"We are realists," Dr. Gabriel Dolle, the IAAF's medical and anti-doping director said. "Some athletes escape detection. We must continue our efforts."

But remember this: Expect there to be bad news before the conclusion of the Osaka meet.