Team New Zealand have rounded the halfway mark in their America's Cup defence

They have claimed a 23-second win over Britannia to take a 4-0 lead in the first-to-seven series off the coast of Barcelona.

The New Zealand-based syndicate was faster on average upwind and downwind.

That was despite the British-owned outfit having a slight advantage off the start line.

Team New Zealand flight controller Andy Maloney explains their reaction.