Northern Irishman Darren Clarke climbed back into contention after a 66, following a weather-shortened second day at the Avantha Masters in Delhi.
Clarke's round featured nine birdies, seven of which came in his last 11 holes, moving him to seven under par.
He was joined by Oliver Fisher, who posted a 67, and Siem who had dropped off the pace after three straight bogeys from the 12th saw him one over with three holes of his second round to go.
Barry Lane was delighted to show he can still mix it with the young guns of the European Tour after the veteran Englishman took the clubhouse lead.
The 49-year-old carded a second consecutive 67 to move to 10 under par, level with compatriot John Parry and Taiwan's Chan Yih-shin who both have one hole remaining in their second rounds after play was curtailed due to lightning.
Lane, who is set to join the Senior Tour in June, has only finished in the top 30 of a European Tour event twice in the last two years but is poised to improve that record following two excellent rounds at DLF Golf and Country Club.
© UTV News