Donemana need to win only two of their last three Long's SuperValu games - against teams all in the bottom half of the table - to claim their second successive league and cup double.
They hit the front with a three wickets victory over long-time leaders Coleraine and can lift the trophy again at Bready on Saturday week.
It was Junior McBrine, just a month before his 54th birthday, who was yet again the stand-out performer for Donemana, taking four for 14 from his 10 overs as Coleraine were bowled out for 186 and then, coming to the middle at 143 for seven, he hit 29 not out in a stand with Dwayne McGerrigle to win the match in the 43rd over.
Next up for Donemana is an away game against Fox Lodge who won their third game of the season, against Bready, with a fourth wicket stand of 94 between Cebo Tshiki (59) and Brian Allen (60) the key.
The Foxes actually collapsed from 178 for three to 213 all out as Irosh Samaritan ripped through the tail to finish with five for 39. But they still had more than enough as only the Sri Lankan with 60 made any significant contribution in their reply, bowled out for 140.
Brigade remain a comfortable third after dismissing Ardmore for 130 (Andy Britton 4-13) and winning by seven wickets. The Bleachgreen side have only Drummond below them, but 64 points adrift, after losing to Eglinton by eight wickets, Drummond's fate will be sealed if they fail to beat Ardmore on Saturday.