Countryman Tomás Etcheverry fell to Wawrinka earlier in day four of the tournament
Tennis
Tomás Etcheverry is the other Argentine to win his match, while Schwartzman, Pella, DÃaz and Podoroska are out
Pedro CachÃn was the lone Argentine to be eliminated in the first round of the tournament.
Nine Argentines will take part, including Francisco Cerúndolo and Sebastián Báez