Question: What is the name of the professional baseball team based in Washington DC which played at RFK Stadium and Nationals Park and for whom Melvin Dorta had his debut in 2006?
Sentence (from "2012 Washington Nationals season"): On September 20, the Nationals beat the Los Angeles Dodgers to clinch the franchise's first postseason berth since 1981, and the first for a Washington-based team since the Washington Senators won the American League pennant in 1933.
Relevant evidence: No