The Risers found it hard from the start after winning the toss and electing to bat first.
Delbert Gayle (27) and Nicholas Lewin (15 not out) were the only batsmen to reach double figures as pacers Ojay Shields (2-9 off two overs) and Andel Gordon (2-13 off two) combined to restrict the Risers to a modest 72-6 off their 10 overs.
Jamaica Scorpions all-rounder Alwyn Williams with 30 not out and Damani Sewell with 15 not out then helped the Stars reach 71-1 in the eighth over before rain ended proceedings with the Stars comfortably 19 runs ahead of the Duckworth/Lewis par score.
West Indies opener John Campbell earlier made 20 for the Stars who now have four wins from eight matches.
Asking the Stars to bat first after winning the toss, the Warriors had early success after removing West Indies opener John Campbell for 14.
Sashane Anderson (22) and Suwayne Wilson (12) were the only other Stars batsmen to reach double figures as Frew, a member of the West Indies U-19 World Cup winning squad in 2016, ripped through the batting line-up to finish with figures of 4-16 from his two overs.
In the end, the Stars were restricted to a modest 81-7 off their 10 overs.
The Warriors made light work of the chase, reaching 83-3 off 8.4 overs to get their second win of the competition.
They got home thanks to some indiscipline from the Stars bowlers and solid showings from Ockeeno Farqharson (21), Jevoy Spence (15) and Andre McCarthy (13 not out).
West Indies U-19 representative Andel Gordon took 2-11 off his two overs.
After winning the toss and choosing to field first, the Kings were in good form with the ball, holding the United Stars to a modest 82-6 in their 10 overs.
Jamaica Scorpions player, Alwyn Williams, was the only batsman to make a significant contribution for the Stars with 35 against 3-13 off two overs from medium-pacer Oraine Williams and 2-5 off one over from leg-spinner Kenroy Williams.
When it came time for the Kings to chase, McCarthy, batting at number four, was the chief destroyer with his 39 coming off just 12 balls including two fours and four sixes.
Opener Kennar Lewis also contributed 19 as the Kings easily chased their target reaching 83-3 off just 5.3 overs.
Left-arm quick Andel Gordon was the best bowler for the United Stars with 2-21 from his two overs.
The Surrey Kings now have five wins in five games, living up to their tag as favourites.
The day started with the Kings losing to the Middlesex United Stars in a super over.
The United Stars win the toss and elected to field first, restricting the Kings, albeit with a number of changes to their team, to 85-7 off their 10 overs with Kenroy Williams (22) and Xavier Burton (17) being the main scorers.
Tyrone Daley was the pick of the bowlers for the United Stars with 2-14 from his two overs.
Top scores of 38 not out from captain and West Indies opener John Campbell and 21 from Jamaica Scorpions all-rounder Alwyn Williams then allowed the United Stars to match the Kings total reaching 85-6 off 10 overs.
The same pair along with Daley then combined to post 13-1 in the super over before Ojay Shields restricted the Kings pair of Jeavor Royal and Brad Barnes to eight without loss to secure the win.
The Surrey Royals got the better of the Cornwall Warriors in the second match of the day by nine wickets.
The Royals restricted the Warriors to 86-6 off their 10 overs after winning the toss and choosing to field first.
Captain Damian Ebanks (25), Damion Bryce (21 not out) and Kerry Holness (18) were the main contributors for the Warriors against an excellent 2-8 off two overs from Jamaica Scorpions pacer Nicholson Gordon.
The Royals then successfully got to 87-1 off 8.1 overs thanks to 61 not out off 29 balls from wicketkeeper/batsman Romaine Morris.
With the league stage now completed, Wednesday will see the Cornwall Warriors and the Surrey Risers contest the fifth-place playoff, while the third-place playoff will be an all-Middlesex affair with the Titans taking on the United Stars before a champion is crowned on Thursday when the Surrey Royals and the Surrey Kings battle it out.
