Cristiano Ronaldo's Al-Nassr were knocked out of the Kings Cup in the last 16 after a 2-1 defeat by rivals Al-Ittihad.
The visitors struck first in the 15th minute when Benzema produced a cool finish from the centre of the box, guiding a left-footed effort into the bottom corner after being picked out by Moussa Diaby on a quick counter.
Al-Nassr tried to respond but struggled to break down a compact Al-Ittihad defence, with Ronaldo seeing a long-range strike saved by Predrag Rajkovic.
Author's summary: Al-Nassr knocked out of Kings Cup.