This follows the Scotsman’s win of the Rolex Grand Prix with Hello Sanctos in Geneva, Switzerland, in December last year, where he also claimed the Rolex International Jumping Riders Club (IJRC) Top 10 Final.
Scott will now bid for the €1m (£707,386) bonus on offer for any rider who can claim all three grands prix — CHI Geneva, Aachen and Spruce Meadows.
“I’ve everything I want — a wonderful horse and wonderful owners, and my team are unbelievable. I’m on top of the world today,” said Scott of his win last year.
“I’ll put Aachen on my list now — I’ll be trying!”
Scott recently returned to the top spot in the Longines world rankings (7 May).
The 29-year-old had held the position as world number one for 16 months from December 2013. However he lost his position last month to Germany’s Daniel Deusser, dropping to number two in the world.
Some good results recently, including dual victory at the Longines Global Champions Tour of Miami, have helped Scott back to the top.
Following Aachen, the final leg of the Rolex Grand Slam of Showjumping will be held at Spruce Meadows, Canada (9-13 September).
Since the sport’s three majors were combined in 2013, no one rider has managed to win more than one stage.
Rolex Grand Prix Aachen — previous winners
2014 Christian Ahlmann (GER), Codex One
2013 Nick Skelton (GBR), Big Star
2012 Michael Whitaker (GBR), GIG Amai
2011 Janne Friederike Meyer (GER), Cellagon Lambrasco
2010 Eric Lamaze (CAN), Hickstead
2009 Denis Lynch (IRL), Lantinus
2008 Albert Zoer (NED), Sam
2007 Elizabeth Madden (USA), Authentic
2006 Jos Lansink (BEL), Cumano
2005 Meredith Michaels-Beerbaum, (GER) Shutterfly