Robin Roberts, co-host of ABC's "Good Morning America," revealed that she has been diagnosed with MDS (myelodysplastic syndrome) five years after successfully beating breast cancer.

On Monday a teary-eyed Roberts shared her diagnosis during an emotional segment on "GMA," and while she remains confident that she will beat the disease, she has requested prayers.

"I've always been a fighter, and with all of your prayers and support, a winner...My doctors tell me I'm going to beat this -- and I know it's true," Roberts wrote on gma.yahoo.com.

"When I faced breast cancer, your prayers and good wishes sustained me, gave me such hope and played a major role in my recovery. In facing this new challenge, I ask humbly for more of your prayers and love - as I will keep you in my mine and update you regularly on my condition," she wrote.

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