Team NZ shadowing Oracle who remain with a slight edge. Barker set to go left inside Oracle at the line...
Team NZ darts on the inside are are across the line barely in front!
Great acceleration from Barker to get underneath Spithill.
And now, who will reach the first mark in front?
Oracle have come over the top and will round mark one in front.
Fine work from Oracle and the real racing begins in earnest.
Oracle extend their early lead to 120m.
The breeze is blowing off the shore more than earlier days, meaning fewer opportunities for passing.
Oracle almost out to a 200m lead as Team NZ get ready to gybe.
Nice gybe which is immediately followed by Oracle.
The boats heading just pass Alcatraz and approaching the right-side boundary.
Oracle gybe to head back inward and they now have a straight shot to the second mark.
Oracle lead at mark two and both boats roll into their tack.
Now the real battle begins: will Team NZ again show their upwind speed advantage and can Oracle maintain their edge?
Oracle about 50m in front and off to the very right boundary of the course.
Oracle gybe back inwards and Team NZ make a decent gain.
Team NZ have made inroads into the deficit as the boats had their first intersection. The Kiwis now tack and the boats are heading back towards each other.
Team NZ have taken their first lead.
And Barker tacks across the front of Oracle.
Oracle now trailing Team NZ but the boats are still within shouting distance.
Spithill on the race radio: 'We've got to get this sorted.'
Team NZ opening up a significant advantage now, 300m on the water.
Team NZ have a huge advantage in their tacking this morning, with each manoeuvre increasing their lead.
There's a big speed distance between the boats as they head upwind - it again seems to be shaping as the winning of the race.