West Zone batsmen took up the challenge scoring 125 for loss of two wickets at close of play on the third day of the match.
West Zone now need 341 runs to win on the final day of play tomorrow. Much of the run chase would depend on not out batsmen Wasim Zaffer and Amul Majumdar, who were at the crease with 56 and 46 runs respectively.
Earlier, resuming their overnight score of 83 for one Sri Lanka A batsmen lost wickets at regular intervals before declaring their innings at 290 for seven.
Michael Vendort, M Warnapura and Chamara Silva scored half centuiries while Jehan Mubarak and T Samaraweera scored 40 and 35 runs respectively.
The wickets were shared by West Zone bowlers with Rajesh Pawar taking 2/92 while the rest bowlers claiming one wicket each.
With 33 overs of play remaining the West Zone started their run chase at a brisk pace. Wasim Zaffer and Dhiraj Yadav opened the innings but Yadav fell to Dhamika Prasad for 2 runs. Rohit Sharma also departed early scoring only 15.
Amul Majumdar and Zaffer played strokes all round the wicket and took the score to 125 for 2 at close of the play.