Workers use special lights to take care of the grass at the Ciudad de La Plata Stadium in La Plata, Argentina, Wednesday. June. 29, 2011. Located some 60 kilometers, about 35 miles, southeast of Buenos Aires, the venue will be the most modern used in the Copa America. The all-seat stadium was opened in 2003 and will host the opening game on Friday between Argentina and Bolivia. (AP Photo/Pedro Fosco)