Ding will face Robbie Williams in the last four on Friday after he completed a 4-0 win over Anthony McGill.
Stephen Maguire was a 4-3 winner over Michael White while Aditya Mehta won the 'Indian derby' with a 4-3 victory over Pankaaj Advani.
NEIL ROBERTSON 2-4 DING JUNHUI
ANTHONY MCGILL 0-4 ROBBIE WILLIAMS . .
MICHAEL WHITE 3-4 STEPHEN MAGUIRE . .
PANKAJ ADVANI 3-4 ADITYA MEHTA