Galle who head the points table with 13 points from 3 wins will meet second placed Dambulla (10 points from 2 wins) in a top of the table clash at the R Premadasa Stadium.
The other match at the P Sara Oval is between third placed Colombo and Kandy.
Tharanga is the leading batsman in the tournament with 215 runs (avg. 53.75) from 4 matches while team mate Malinda Pushpakumara is the leading wicket taker with 9 wickets (avg. 11.8) from 3 matches.