Cristiano Ronaldo's Al Nassr are one of three big-spending Saudi Arabian clubs hunting AFC Champions League glory on home soil when the final knockout stages begin on Friday.Saudi teams dominated the West Zone league stages,

The only one of the four ties not to feature a Saudi Arabian club takes place on Sunday when two-time champion Al-Sadd of Qatar take on Kawasaki Frontale, a Japanese club looking for a first title

Three home teams in the hunt as desert nation hosts the knockout stages, with contenders also from Japan, Qatar, South Korea and Thailand.