The Scots came from behind in all three knockout games yesterday in the final World 7s Series event of the season to secure the trophy they won in equally thrilling style past year.
They say anything can happen in Sevens and that proved to be the case on Sunday as Scotland stunned hosts England 12-7 to defend their London title on the World Rugby Sevens Series circuit.
"I'm proud of the players and I'm proud of the staff, " said MacRae.
It was Simon Amor's England who started strongly despite losing Ollie Lindsay-Hague, who scored a hat-trick against Canada in the semi-final, early to injury.
Richard de Carpentier then went close to adding to England's lead, only for it to be ruled that his foot was in touch and that was as close as either side came to adding to the scoreline before half-time.
France picked up the pace after their initial pool defeat; they were run close before beating Russian Federation, 26-20, but surprised Scotland later in the day with a Pierre Popelin try making the difference as the French claimed victory, 17-12.
The Canadians wrapped up pool play with a 28-14 win over Japan and advanced to the Cup quarter-finals after the All Blacks beat Fiji 27-21.
Canada beat U.S. 22-19 to take bronze in the series finale, while Olympic champions Fiji finished third in the overall standings.
Scotland have been playing global rugby union against New Zealand for 112 years.
Having lost to South Africa in the final of the Paris Sevens last week, Scotland went one step further in London thanks to second-half tries from Hugh Blake and Scott Riddell. "To play in eight finals and win five is something we are very proud of".
The Kiwis gave away a late penalty when it was discovered they had eight players on the pitch and Scotland scored the winning try.
It was a valuable way to end the day with a quarter-final berth against the United States of America awaiting the Aussies on Sunday morning.
England had the upper hand in the first half of the final after a superb solo try by winger Dan Norton, who recently became the highest try scorer in rugby sevens history.
England had reached the final by beating overall Series champions South Africa 17-12 in the quarter-finals and ruthlessly dispatching Canada 24-5 in the last-four.