LOS ANGELES—Behind the red-hot bat of Eddie Rosario, the Atlanta Braves are one win away from their first World Series appearance since 1999. All they need to do is put away the defending champion Los Angeles Dodgers. Easier said than done. After all, the Braves were in exactly the same position last year and failed to finish the job. Rosario homered twice in his second four-hit game of the NL Championship Series and six Atlanta pitchers combined on a four-hitter, giving the Braves a 9-2 victory Wednesday for a commanding 3-1 lead in the best-of-seven playoff. Game 5 is Thursday in Los Angeles. Last year, the Dodgers also trailed 0-2 and 1-3 against Atlanta in the NLCS before roaring back to win three straight games at a neutral site in Arlington, Texas. “As we saw last year, winning a game is hard, especially a veteran team like this that we’re …