Washington starter Stephen Strasburg left the game after two innings due to an apparent back injury. He grimaced after throwing a pitch in the second, but stayed in the game through that inning.
Washington Manager Davey Johnson said Strasburg would return to Washington for evaluation.
Four Washington relievers allowed two hits over the final seven innings with Craig Stammen (3-1) working four frames to get the win. Rafael Soriano needed just nine pitches to produce a 1-2-3 ninth inning that gave him his 15th save.
Span tripled in the first and scored on Lombardozzi's sacrifice fly. They teamed up to do the same thing in the sixth and the other Washington run came on a fielder's choice grounder from Kurt Suzuki in the second.
The three Washington runs were given up by Julio Teheran (3-2), who struck out nine in 6 2/3.