The two sides have met twice in the tournament this year and it is one win apiece - so who will win the decider?
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St Lucia Zouks v Trinbago Knight Riders - CPL 2016 play-off 2 - preview and live cricket streaming
St Lucia Zouks v Trinbago Knight Riders
Caribbean Premier League 2016, play-off 2, Warner Park, St Kitts
Thursday, 4th August, 19:00 local, 23:00 GMT
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St Lucia Zouks take on Trinbago Knight Riders in the second Caribbean Premier League 2016 play-off at Warner Park, with both sides knowing that for the loser, it will be the end of the journey for this year.
The winner will play the loser of the first play-off between Guyana Amazon Warriors and Jamaica Tallawahs for a chance to reach the final.
All to play for then, and everything to lose for two sides that come into this play-off having had very different seasons.
The Zouks played their early games away from home and only picked up one win on the road. Then they headed to the new Darren Sammy International Stadium and won three out of four matches to propel themselves into the play-offs - although the only game they lost was to Trinbago.
In Florida, they were outstanding, beating the Tallawahs twice to guarantee third place in the standings.
Trinbago, meanwhile, opened the tournament at home, and lost the tournament's first match against the Zouks, as well as two others, which left them needing wins on the road.
These they got, beating early leaders Guyana Amazon Warriors, Barbados Tridents and then the Zouks.
As the Florida leg began, they still needed a result to qualify, and after they unexpectedly lost their first match against St Kitts & Nevis Patriots, they bounced back to see them off comfortably two days later.
That gives them some winning momentum, albeit not as much as St Lucia's, to carry into this match.
For Trinbago, it is clear that they haven't been able to achieve the level of consistency they would like. When they have been good, they'v been good enough to beat anybody, but it just hasn't come together as often as they would like.
"I think we just need to ask more of the same in terms of players stepping up, senior guys stepping up," says top-order batsman Colin Munro.
"It is nice looking back at the whole tournament with people stepping up in different situations.
"So if we got three or four players playing to their potential our team is pretty dynamic."
One advantage they have is that they have already overcome being under pressure and having to win key games in this tournament due to their poor start at home, and Munro says that could help them in the play-off.
"We all have that calm nature about us. Obviously it is a must win game but at the end of the day it is a game of cricket and we are approaching every game like that after having a not great home leg.
"The experience in our group in terms of tournaments that we have won and great coaching staff we will be nice and relaxed and just go out there and express ourselves as best as we can."
The Zouks, meanwhile, have won five of their last six matches, but they won't need reminding that the one defeat in that run was against the Knight Riders.
However, all-rounder Shane Watson says the team are in confident mood building up to the match.
"We have really got on a really good run," he said.
"Since we went home to St Lucia we have played some really good cricket.
"It is knockout cricket and you have to bring your best but we have certainly got lots of confidence from our last six games."
And the Australian is predicting a high scoring game at the relatively small Warner Park ground in Basseterre.
"It is a beautiful wicket, small boundaries, I am sure it is going to be a high scoring game."
As well as plenty of runs, he is expecting a serious challenge when they come up against the Knight Riders.
"They have matched up really well against us. The last time we played against them in St Lucia Umar Akmal played an incredible innings.
"They have certainly got some very dangerous players like Hashim Amla who is back at the top of the order.
"We are certainly going to have to be at our very best because TKR have a really well balanced team with world class players throughout.
"We played very well against them in Trinidad at the start of the tournament so we need to bring that again."
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© Cricket World 2016
