As the Washington Nationals try to stay relevant in the National League East race, they’ve been getting a lot of production of late from a certain free agent signee. Over his last 15 games, he’s batting .327 with five homers and 12 RBIs. He homered in both games of a Wednesday doubleheader and drove in four runs as the Nationals swept Philadelphia to get to 35-38. Brian Dozier, the former Southern Miss star, has overcome a slow start with his new team to raise his average to .235. He’s got 12 homers, 28 RBIs and 28 runs. Dozier, who finished 2018 with the Los Angeles Dodgers, signed a one-year, $9 million deal with the Nationals, who are starting to get some bang for those bucks. For comparison sake, the marquee free agent who left Washington and signed with Philadelphia for 13 years and $330 million is in the throes of wicked slump. Bryce Harper, who went 0-for-4 in Wednesday’s twinbill, is hitting .208 with one homer in his last 15 games for a skidding Phillies team that has fallen to 39-34 and 4 games back of Atlanta in the NL East. Harper is batting .243 with 12 homers and 49 RBIs and is third in the NL in strikeouts with 91. (To be fair, he’s tied for second in walks with 47.) He’s even getting booed at home games. Philadelphia brass may not be feeling buyer’s remorse just yet, but they certainly aren’t getting the bang for the buck they expected. … Dozier’s 12th homer of the year accounted for one of the two runs the Nationals scored in a 2-0 win in Wednesday’s second game, the highlight of which was Max Scherzer’s seven brilliant innings the day after suffering a broken nose. “That’s why you put him in the category of one of the best, if not the best, in the game, the best of our generation,” Dozier told mlb.com.