YE Yang and SSP Chowrasia moved into the lead in the UBS Hong Kong Open as overnight leader Udorn Duangdech tumbled down the leaderboard.

Yang and Chowrasia improved to seven-under-par during their second rounds in overcast and chilly morning conditions at Hong Kong Golf Club.

Robert-Jan Derksen will begin his challenge from seven-under this afternoon after finishing the first day a shot adrift of unheralded Thai Duangdecha.

Duangdecha had claimed the first round lead with an eight-under-par 62 yesterday but carded a three-over-par front nine with two bogeys and a double bogey to slip back to five under overall.