At the age of 11, she was recruited by the Cerro Pelado Sports School in her hometown, where she started practicing shot put and discus throw.

The cooperation paid off almost immediately as Moreno established a new world junior record on 29 May 1999 with 66.34 metres at altitude in Mexico City.

Later that year, she won the silver medal at the Pan American Games with 63.03 metres, only beaten by Dawn Ellerbe who threw 65.36.

[4] At the World Championships the same year her only valid throw measured 58.68 metres, giving her an eighteenth place in the final (there was no qualification round).

At the Pan American Games she won the gold ahead of compatriot Yunaika Crawford, smashing Dawn Ellerbe's championship record with a 74.25 metres throw.

Her third round result of 72.52 m further secured the gold as runner-up Olga Kuzenkova managed no more than 71.71 m.[6] Commenting on her victory, Moreno stated that she "was happy for Cuba and my family".

In early 2006, Moreno won her first Central American and Caribbean Games title, setting another championship record with 70.22 metres.

In August she again lost her top ranking position, this time to Russia's Tatyana Lysenko who had established a new world record of 77.80 m. Moreno's season best mark was 74.69 m from the Ostrava Super Grand Prix in May.