PITTSBURGH — Six weeks into his major league career, Zach Eflin is pitching like one of the National League’s best starters.

Eflin threw his first shutout and second complete game in his eighth start and the Philadelphia Phillies beat the Pittsburgh Pirates 4-0 Friday night.

Eflin (3-3) had six strikeouts, allowed three hits and did not walk a batter as he threw 100 pitches for his second complete game in his past four outings. In the majors for just 39 days, the 22-year-old is one of only seven pitchers to have multiple complete games this season.

“Every pitcher doesn’t want to come out of the game. I was able to stay ahead and get quick outs,” Eflin said. “All four of my pitches were working today.”

Cameron Rupp had a home run and three RBIs and Odubel Herrera had three hits and scored twice for the Phillies, who entered having lost four of five.

John Jaso had two of the Pirates’ three hits, including their only one for extra bases (a leadoff double in the second).

Gerrit Cole allowed one run over six innings for Pittsburgh, which entered with the majors’ best record since June 24.

Rupp drove in the game’s first run in the sixth when Herrera scored on his single with the bases loaded and nobody out. Cole (5-6) escaped the remainder of the inning unscathed.

Still, he was lifted for a pinch hitter in the bottom of the inning after throwing 96 pitches, and the Phillies made it 2-0 off Arquimedes Caminero in the seventh. Andrew McCutchen misplayed Herrera’s sharply hit ball into a double with two outs, and Andres Blanco drove him in with a single.

Rupp’s homer came with Blanco on with two outs in the ninth.

“I thought the sixth inning was going to come back to haunt us when we didn’t score,” said Phillies manager Pete Mackanin, whose team had lost its past six at PNC Park dating to 2014.

“It was a good game for us; we haven’t won a lot of games here over the last few years, so it was good to at least set the tone for this series.”

Jaso twice advanced to second base, but no baserunner reached third against Eflin, who has allowed 11 earned runs over his past seven outings since being tagged for nine in his major-league debut June 14 at Toronto.

“He’s not a 95-98 mph type of power pitcher, but he really knows how to pitch,” Mackanin said. “We all saw that debut against the Blue Jays — he never got the ball down, he couldn’t locate. But ever since that start, he’s gotten better and better.”

The closest the Pirates appeared to come to scoring was when Herrera made a leaping grab at the wall in center on a ball Jung Ho Kang hit in the fifth.

Eflin faced 29 Pirates in collecting 27 outs.

“He kept the ball out of the middle, he changed locations, he changed velocity, kept it down,” Pirates manager Clint Hurdle said. “It was a mix of everything.”