Pedzisa mutsara unotevera: Marshall akamiririra United States pamitambo yeOlympic yeZhizha ya2008 muBeijing, kuChina. Akagamuchira menduru yebronze nokushambira nokuda kwechikwata cheU.S. chakabata nzvimbo yechitatu mumakwikwi okutanga e
4×200-mita revakadzi re freestyle. Iye nevamwe vake veboka rokutanga vakagadza chinyorwa chitsva cheAmerica muchiitiko chacho.