A superb century by Jake Egan propelled CIYMS to a ridiculously comfortable victory over Templepatrick.
Despite needing 225 for victory, Egan’s 132 off just 80 balls (15 fours and six sixes) helped the home side to their target by the start of the 29th over.
From 59 for two, Egan shared a third wicket stand of 144 in 18 overs with Herman Rolfes who finished 52 not out.
Captain Ross Bryans top scored for Templepatrick with 89 and received good support from Charles Swart who made 61 in a fourth wicket stand of 116.
But the visitors lost their last six wickets for 17 runs to be bowled out in 46 overs.
Civil Service North must rely on North Down being badly beaten by Woodvale on Sunday if they are to claim a top six place ahead of the split.
Defeat by 101 runs at home to Muckamore leaves them in seventh, behind the Comber side on run-rate.
South African professional Neil Brand was back on duty for the Moylena side and, opening the batting, he hit 131, with 12 fours and five sixes, in his side’s 279 for six.
CSN, bowled out for 79 last week, managed to more than double that total but Ryan Hunter’s 21 was their top score and 30 for the last wicket between Andrew Cowden and Tom Ford was their highest partnership.
Ireland batting coach Gary Wilson batted at No 9 and was caught off Brand for 10.
Not out of the equation either are Cliftonville Academy, who will leapfrog both CSNI and North Down for the sixth slot if they beat Waringstown and North Down lose at Woodvale, by virtue of their superior Nett Run Rate (NRR).