RSL spent several weeks at the top of the Narrabri District Cricket Association first grade ladder, but on Saturday Tatts showed exactly who are the heavyweights in the 2018-19 season.
Tatts and RSL met at Collins Park in round eight of the campaign.
Tatts skipper Tom Craig won the toss and sent his side into bat, and scored an unbeaten 42 as it posted an impressive total of 220 after losing just six wickets in its 45 overs.
Tatts then restricted RSL to 8-107 after 45 overs to win the match by 113 runs.
Tatts lost an early wicket in the match when RSL opening bowler James O’Brien bowled Luke Morgan (9) in the seventh over.
Craig Gleeson then joined Daniel Kahl at the crease and the pair batted together for 22 overs, putting on a 109-run partnership.
RSL finally broke the partnership in the 30th over when Jake Brayshaw bowled Daniel Kahl (49).
That saw Tatts go into drinks at 2-124, which became 3-132 the over after drinks after Gleeson (56) was caught by Nathan Trindall from the bowling of Hamish Duncan.
Craig lost three more partners in the next 14 overs as Tatts finished with 6-220.
Jelany Chillia (31) was the only other Tatts batsman to make double figures.
RSL’s best with the ball were O’Brien (2-30 from six overs) and Brayshaw (2-36 from nine overs).
RSL openers Duncan and Jarrett Tough batted together for 27 overs to start the run chase, but could only combine for 67 runs in that time.