Adam LaRoche cracked a pair of homers Tuesday, going 4-for-4 in the Washington Nationals\' 11-5 rout of the Chicago Cubs. Washington launched six homers in all as Ian Desmond and Tyler Moore hit two-run shots and Jesus Flores and Ryan Zimmerman added bases-empty long balls for the National League East leaders. Jayson Werth chipped in with four hits and an RBI as the Nats took the second contest of a four-game series. Edwin Jackson (9-9) collected the win, yielding four runs on seven hits and a walk to go with eight strikeouts over 5 2/3 innings. Chicago starter Chris Rusin (0-2) was tagged for five runs on eight hits with a walk and a strikeout over an inning-plus. Alfonso Soriano knocked in three runs for the Cubs.