Coventry's success - and the Lizards' first defeat of the season - was mainly due to the firepower of Kimberly Watson and Ruby Versfeld, who both helped themselves to seven goals.
City of Manchester joined Coventry on eight points with two easy victories - 20-4 against Sheffield Sharks and 16-4 against Caledonia.
Hucknall picked up their first points with an 11-6 victory over Leeds Sharks. There were five goals apiece for Hucknall's Katelyn Fairchild and Julie Swieca.
At Marlborough College, three late goals by Olivia Henderson (2) and Isobel Bates gave Mid Sussex Marlins an 11-8 win against English Roses. These two sides now share the lead in Division 2.
City of Bristol fought back from 7-2 down to 7-7 against Division 2 opponents Tyldesley, including a quick hat-trick from Ella-Louise Jones, but Grace Morley, with five goals, steadied the ship for Tyldesley and set up a 14-8 win for her team. Liverpool Liver Birds recovered from 4-1 down to beat Penguin Emperors 8-7.
Photo (Trevor Hyde): Bristol's Lilymay Girvin scores today against Tyldesley, despite the defensive efforts of Megan Price.