Argentine Juan Mónaco defeated Andy Roddick 7-5, 6-0 and advanced to the quarter finals of the Sony Ericsson Miami open.
American Andy Roddick plans to retire after the US Open, the former world number one said on Thursday.
World's seventh ranked tennis player Juan Martín Del Potro defeated US player Andy Roddick, recently retired, in the first of two exhibition matches in Punta del Este, Uruguay.