Nationals try to keep win streak alive against the Cubs

Washington Nationals (56-83, fifth in the NL East) vs. Chicago Cubs (80-60, second in the NL Central) Chicago; Friday, 2:20 p.m. EDT PITCHING PROBABLES: Nationals: Jake Irvin (8-10, 5.42 ERA, 1.41 WHIP, 102 strikeouts); Cubs: Javier Assad (1-1, 4.