New Zealand's other two Olympic bronze medal team members, Jonelle Richards on The Deputy and Mark Todd on Oloa, are 12th and equal 18th respectively.
"I thought it was a better test than he did at Badminton," Paget said of Promise's performance. "He was more consistent the whole way through."
Paget, who won the British Open one-day title at Gatcombe Park last month on Lush, acknowledged there was fresh pressure on him.
"It's certainly a new kind of pressure for me, but you put pressure on yourself anyway. I'm here to win and I'll do whatever it takes to try to make it happen."
Nereo, the last horse into the arena, produced a consistent performance. And Nicholson was confident Nereo would navigate the cross country, which has 31 fences, with similar poise last night (NZT).
"Nereo's tackled all sorts of courses all over the world. He prefers a big, galloping track as he's got such a huge stride and he has to work quite hard across the undulations here, but I'm sure he'll cope with it, as he's done before."