Canterbury provided Waikato with their first loss of the season going down 28-10 although the northerners remain in a share of second place two points behind the leaders.
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Counties Manukau came out well on top of neighbours Auckland with a 31-12 win at home.
Manawatu are also on the pace with their second win of the season coming over Bay of Plenty 22-10. Bonus points have been what has given Canterbury and Counties Manukau their advantage.
Bay of Plenty are winless in the Premiership so far.
Wellington have edged one point ahead of Otago after their 38-10 win over the southerners in the Championship. Hawke's Bay, who beat Taranaki 55-10 are in third place.
North Harbour crushed Tasman 51-14 in the final match of the round played live on Sky Sport on Sunday.
Wellinton 38 (Ayesha Leti-Liga 2, Angeline Uila, Jackie Patea-Fereti, Bernadette Robertson tries; Amanda Rasch 5 con, pen) Otago 10 (Kiana Wereta, Amy du Plessis tries). HT: 10-5
Counties Manukau 31 (Aotearoa Matau, Waikohika Flesher, Piliu Feofa'aki 2 tries; Arihiana Marino-Tauhinu 4 con, pen) Auckland 12 (Natahlia Moors, Ruahei Demant tries; Demant con)
Manawatu 22 (Selica Winiata, Lauren Balsillie, Megan Gaffney, Vaine Greig tries; Kalyn Takitimu-Cook con) Bay of Plenty 10 (Baye Jacob try; Renee Holmes con; Sapphire Tapsell pen)
Taranaki 10 (Jessie Aitken-Fowell, Awhina Blackburn-Kingi tries) Hawke's Bay 55 (Shaylee Tipiwai 2, Krysten Cottrell 2, Felicity Powdrell, Natasha Greville 2, Chanel Huddleston, Hanna Brough tries; Cottrell 5 con).