Phillips' Taieri side finished as the only team to win both its games, while Kelly's Green Island won its only game.
No3 batsman Phillips, who has come south from Auckland, scored 94 before he was caught off the bowling of Jacob Duffy.
The 20-year-old guided Taieri to 156 for four against Kaikorai, before taking three for 26 with the ball.
That included the key wicket of Josh Finnie (46). Regan Flaws, Ben Lockrose and Tom Myles all chipped in with two wickets, to bowl Kaikorai out for 147.
In the second game Phillips (38) and Cam McAuslan (40) put on 62 for the second wicket against North East Valley.
That was ended when Anaru Kitchen bowled McAuslan.
Kitchen tore through the middle order, claiming five for 12 and restricting Taieri to 115 for seven in a 16-over game.
That proved enough, though.
North East Valley's batting line-up did not fire, aside from a handy 40 from opener Llew Johnson.
Flaws and Myles both chimed in with two wickets apiece to hold North East Valley to 103.
Perennial favourite Green Island put on dominant display against University Grange.
Kelly smashed 85 runs from 45 balls to have his side at 107 for two when he was dismissed in the 12th over.
That brought Joel Meade to the crease and he was unbeaten on 55 when the innings ended at 193 for three.
University Grange offered little resistance, as Jack Mockford took three for 13 and Blair Soper two for 18, to bowl it out for 119.
It fared little better against Carisbrook Dunedin.
Only two University Grange batsmen made double figures as it was held to 75 for nine in 18 overs, Steve Newey taking three for 16 for Carisbrook Dunedin.
Despite two early wickets, Carisbrook Dunedin easily chased the target, Newey (29) and Jack Pryde (24) managing an unbeaten 49-run partnership for the third wicket.
In its other match Carisbrook Dunedin was beaten by North East Valley.
Carisbrook Dunedin batted first and made 129 for six, Richard Sillars top-scoring with 43.
However, Volts duo Neil Broom and Kitchen scored 44 and 38 not out respectively, to help chase down the target.
Taine Bayly took four for 16 as Kaikorai bowled out Albion for 114, before Josh Finnie top-scored with 57 to reach the target within 14 overs.
