After seven straight wins, it's time for PERTH to face Hadspen, the team they last lost to back in December's round eight.
The form team of the competition rolled through ACL last week, confirming themselves a finals spot after winning just one match last season, much to the delight of captain John Hayes.
"It was a good win but we still have a lot to improve on, obviously with Hadspen this week and finals quickly approaching," he said.
"Our fielding has been pretty good but we can't be bowling too many extras or boundary balls against a team like Hadspen."
The Demons lose Keelan Beattie and Ethan Goldfinch, who have been integral to their recent form but Hayes is confident their replacements will step up.
Liam Reynolds' Hadspen also comes into the clash on a high after taking out the Northern T20 finals against Dane Anderson's old side, Westbury, on Sunday.
Having not bowled first in TCL play since their last Perth clash, last week's Legana game gave the Chieftains the opportunity to do so.
"It was good that we were able to execute our plans and to knock off the runs early in the piece was really good," Reynolds said.
"We can't take them lightly, they are a quality side and no matter what, in the last few years we've had some really tight contests with them."
Another team coming into this week with form, Evandale Panthers, face Legana as they look to reverse their round eight result.
The last two weeks have seen the Panthers notch up consecutive wins for the first time in premier league, with captain Jonty Manktelow describing the win "their best performance of the season".
"We want to keep winning for sure and finish off the season strong," he said.
"Legana got us pretty convincingly last time and we are pretty keen to get one back against them."
The Durhams will make one change for the clash, with Sam Hay out and Mike Dunn coming back in as coach Michael Quill is eager to get a win for their life members as they host a past players day.
Trevallyn hosts ACL as the two sides aim to get back on the winners' list.
ACL hasn't tasted victory since December 5 but last week saw economic spells from opening bowlers Simon Chappell and Cameron Martin against the in-form Perth batting line-up.
For James Whiteley's Trevallyn, it's been a shorter stint away from a victory - last winning on January 30 - with the coach describing last week's effort as "horrible".
"It showed us what not to do but our bowling innings, as short as it was, was actually quite pleasing," he said.
"It's good to be back at home this week, ACL are always a good, strong team, so I'm looking forward to it."
His side loses Drew Clark in a major out but Dan Forster returns in a top-order switch-up.
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Bracknell will be looking to finish their first year in the premier league with a bang as they take on George Town before their round 18 bye.
Last season's A-grade premiers have picked up two wins in their maiden season, with one of them being the Saints, but they will need to improve on their recent batting performances to repeat the result - having only reached 100-plus once in the past four weeks.
The Dylan Semmens-coached unit look set to finish the season as wooden spooners, currently owning a significantly poorer net run rate than Legana, who are a game clear in eighth position.
Jack Hill's Saints have tasted success on four occasions in their first season since crossing over from Cricket North - beating Evandale, Legana, ACL and Trevallyn - and could end this round in sixth if results fall their way.
The premier league competition has two more rounds before finals get under way, with the grand final to be played on March 27.