Nick Senzel made a leaping catch against the right-field wall to save a run in the ninth inning, then hit a two-run homer leading off the 10th to lift the Cincinnati Reds over the Nationals 5-4 Thursday for their first series sweep at Washington since 2006. Cincinnati (49-39) stretched its winning streak to five with the four-game sweep that maintained a two-game lead over the second-place Brewers in the NL Central heading into a weekend series at Milwaukee.