All eyes were on Everson Pereira on Tuesday, but another 22-year-old spoiled the outfielder’s major league debut. With the game knotted at one in the eighth, the Nationals’ CJ Abrams lined a Tommy Kahnle changeup off the right field foul pole. The home run paved the way for a 2-1 Washington win — and the Yankees’ ninth straight loss. The Yankees have not lost nine in a row since 1982. “Pretty down, but we gotta fight through it,” Aaron Boone said of the team’s morale.