Last year's Cricket North grand finalists both found their first wins of the season on Saturday thanks to big knocks from star batsmen.
At Westbury, Dane Anderson picked up where he left off last season with an unbeaten ton against Riverside.
Chasing a competitive 9-173, Anderson opened with returning all-rounder Matthew Battle (56) and the experienced pair reached 142 before Sam Artis clean bowled the latter and Oli Wood in consecutive balls.
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The Shamrocks reached the total just five overs later as Anderson whacked a four off the final ball of the game to finish 103 not out.
The 87-ball knock featured 12 fours and four sixes and marked the second year running that the ex-Tiger had reached three figures in his first game of the season.
"It was fun to watch but frustrating at the same time," Blues captain Tom Garwood said.
"We tried a few things which didn't work today and we'll take that as a learning curve and take his innings and hopefully our batters can learn from what he did.
"We never gave up but he's a class above the rest."
Earlier, the Blues recovered from 5-65 courtesy of a 73-run stand between birthday boy Ben Simpson (32*) and Lyndon Stubbs (38).
Shamrocks young gun Kaleb Williams spoilt the party with the round's best figures of 4-21 as Alex Kerrison took a miserly 3-15 off 10 overs to hand Dan Murfet his first win as captain.
"Today was really pleasing," Murfet said.
"A few of the young guys stepped up - Kaleb Williams was really impressive and showed a lot of maturity.
"He took his first first-grade wicket and went on to get a couple more which was really cool and [Anderson] led the way he always does.
"It's probably also more about him leading the way for all the younger guys to follow - it's not necessarily up to him to do that [every week] now, he's done his bit."
At the NTCA, South Launceston powerhouses Sean Harris (73*) and Nathan Philip (57*) led their side to a seven-wicket bonus-point win over Launceston.
Coming together at 3-96, the pair put on a century stand to pass Launceston's 193 all out inside 38 overs.
James Curran (2-43) was the Lions' only wicket-taker.
Opting to bat first, the Lions made it to 0-85 as Sam Elliston-Buckley and Cam Lynch both reached the 40s.
But Ishang Shah and Anders Bulow's maiden Cricket North wickets brought South back in the game, leaving Jackson Young (4-44) free to wipe out the tail.
"We probably didn't have the best start with the ball today and we really pulled it back," Knights captain Tom Waller said.
"The big turning point for us today was Ish Shah - he came on the over before drinks and then bowled eight straight and got us two wickets.
"He didn't actually get a bowl last week, so it was good from him today to get a bit of confidence and he offers us a bit with the bat too.
"Hopefully he can keep building."
- Dane Anderson 103*
- Sean Harris 73*
- Nathan Philip 57*
- Kaleb Williams 4-21
- Jackson Young 4-44
- Alex Kerrison 3-15
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