Date of Birth: 
About Sergio Hierrezuelo
- Sergio Hierrezuelo Castellanos (15 March 1982) is a retired Cuban athlete who specialised in the 400 metres hurdles.
- He reached the semifinals of the 2005 World Championships.
- In addition, early in his career he won the silver medal at the 1999 World Youth Championships. His personal best in the event is 49.11 seconds, set in 2005.
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