PETALING JAYA: National men’s doubles coach Tan Bin Shen has narrowed it down to lacking confidence as probably the one significant factor that has been separating Aaron Chia-Soh Wooi Yik from the world top four combinations.

The challenge for Aaron-Wooi Yik in tournaments, including the All-England which begins in Birmingham today, is to regain their self-belief and start playing courageously that has helped them with podium finishes in major events.