Cooper was unbeaten on 125 off 110 balls.
Broad Oak are top of the table but have a few tough weeks ahead of them.
Cooper is playing at Broad Oak alongside Harvey Booth, who played for Onerahi Central last season. The season has progressed well for Cooper, after a cold start - the first match he was supposed to play was snowed out - a first for the Northlander.
En route to Huddersfield, Cooper played in a 6-aside tournament in Thailand and finished as the competition's top scorer, despite not playing in the final.
Cooper played for Gloucestershire Gypsies who went down to a team of Pakistan first class players in the semifinal.
Batters had to retire at 30 - something Cooper did in each game he played.
Cooper and fellow Northland representative Ben Hyde, from the Kamo Cricket Club, are both in the UK with the assistance of Cobham Cricket Club and the Northland Cricket Association.
Hyde has also enjoyed success, scoring 50 for his Worlington side, and taking 2-59 in the same match against Copford.