Aleksandar Mitrovic scored a penalty in the 10th minute of second-half stoppage time as Al-Hilal denied Cristiano Ronaldo's Al-Nassr victory in a 1-1 draw.
Mitrovic netted his 27th Saudi Pro League goal of the campaign after Sadio Mane was harshly judged to have fouled Saud Abdulhamid in the area.
Mane stuck out an arm to shield the ball, catching his opponent in the throat, though the contact appeared to have been outside of the box.
Mitrovic made no mistake to keep Al-Hilal's unbeaten campaign going.
The Serbian's spot-kick cancelled out Otavio's first-minute opener, with Ronaldo having set up his compatriot.
Champions Al-Hilal remain 12 points clear of Al-Nassr at the summit of the Pro League standings.
Data Debrief: Ronaldo the provider
Ronaldo leads the scoring charts in Saudi Arabia this season, though he had to settle for an assist on Friday.
That came from the only chance he created, with the 39-year-old limited to 25 touches, though he did have four shots.