LOS ANGELES — Blake Snell reared back and let loose a 97 mph elevated fastball high and out of the zone, but Pittsburgh Pirates outfielder Nick Yorke couldn’t help himself and swung through it for strike three.It capped off another dazzling outing for Snell, who racked up six innings of two-hit ball with six strikeouts in the Los Angeles Dodgers’ 4-0 win Sunday afternoon, with the Dodgers sweeping Pittsburgh to notch a sixth straight win.It also served as a stark reminder to the rest of the league: September is approaching, and with it comes the expected return of the back-to-back champs’ prized starting rotation. The Dodgers have been without their projected group all season, but with postseason races heating up, their staff of aces is close to full health and raring to go.In other words, right on cue.“It’s going to be a lot of good competition within the starting rotation,” said Snell, who has allowed just two earned runs in his three starts since coming off the IL. “I’m really excited about it. I mean, being able to watch some of the best pitchers in the game and learn from them — their mentality, the way they attack — having those conversations are very big. I’m definitely grateful to be on the same team.”