Plymouth's Morgan Uceny is the fastest American women in the 1500 meters.

Plymouth's Morgan Uceny is the fastest American women in the 1500 meters. (June 30, 2012)

Morgan Uceny'c chances for winning a medal at the 2012 Olympic Games in London just got a little better.

Mariem Alaoui Selsouli, Uceny's top competition at the Games,  has tested positive for a banned diuretic and will miss the London Olympics, the governing body of international athletics said on Wednesday.

"I'm glad she was caught before the Games,"  Uceny told South Bend Tribune correspondant Tim Creason in an email from Italy, where she's training.

"She (Selsouli) was already banned once from doping, and it was not much of a shock that she tested positive again after the way she ran in Paris. I'm sure there are other cheaters out there and I just hope the world anti-doping agency continues their efforts to keep our sport clean."

Selsouli, a silver medalist at the world indoor championships this year, has already served a two-year suspension for doping and now faces a lifetime ban under World Anti-Doping Agency (WADA) rules.

The 28-year-old became the hot favorite to win 1,500m gold in London when she ran three minutes 56.15 seconds earlier this month.

It was the fastest 1,500 meters time since 2006 and shaved more than four seconds off her personal best, raising question marks that were answered on Wednesday.  

Selsouli is the #2 ranked woman in the world in the 1,500 meters.  Uceny is ranked 6th. 

The preliminaries for the 1,500 meters is on Monday, August 6th.