The 24-year-old first baseman is still hitting .278 this season.
Just one Atlanta runner reached third base in six innings against him.
Luis Garcia surrendered the lead in the bottom of the eighth.
They will complete the season without using one. The shortage extends to the high minors.
He gave up five runs in the first inning, sucking the life out of the offense.
The 24-year-old Puerto Rico native achieved a dream last month when the Phillies promoted him to the majors, but it's hard to focus on anything but his homeland.
Rhys Hoskins and Nick Williams had big hits, but L.A. avoided a sweep.
Sean Doolittle has never played a Major League game in Citizens Bank Park, but starred there in the Carpenter Cup.
"Professional is how I wanted to handle it," Joseph said. "I understand right now what needs to happen."
Aaron Altherr had four RBIs in his last two plate appearances to give the Phillies their third straight win against the best team in baseball.
The Phillies' young talent is ready to go, and they have a surplus right now, but it might be smart to stockpile some of it on the bench in 2017.
The rookie has yet to show his power stroke, but he has been getting on base.
He hit a bases-loaded double to the wall in left-center field to break the game open.
Scott Kingery and Tom Eshelman received the Paul Owens Award on Tuesday night and should reach the majors sometime in 2018.