Francesco Laporta overcame a mixed start to move into the outright lead at the Trophee Hassan II at the end of day two, sitting one stroke ahead of the chasing pack.
After birdying holes 10 and 12 in Rabat, Laporta - who started on the 10th - bogeyed 13 and doubled 14 to undo his earlier good work.
However, Laporta arrested his brief slump with a sterling putting display, which saw him make four gains over the next six holes to move to seven under.
A poor approach on the eighth cut Laporta's lead to one over Borja Virto Astudillo, Jason Scrivener and Wang Jeunghun.
"It's going to be exciting at the weekend," Laporta is quoted as saying by the European Tour's official website. "It should be a great experience and I'm looking forward to it.
"It was just a really solid display and I enjoyed it."
Scrivener held a share of the lead heading into day two but fell behind after a one-under round on Friday, while Wang's round of four under was only bettered by Lukas Nemecz, who is now even par for the tournament.
Thomas Linard, who was tied for the lead with Laporta and Scrivener at the start of the day, saw his challenge fall apart thanks to a five-over round of 77, suffering three bogeys and a double on his outward nine.
A further five bogeys on the way back compounded his second-round woe.