Ranked a humble 89, Simon landed on his visit to India without his coach and other support staff but was ready for the grind and scalped the two Grand Slam finalists in 2017 at the Tata Open Maharashtra.
The 33-year-old parted ways with his coach Jan de Witt mental coach Ronax Lafaix and physical trainer Milos Jelisavic.
His rivals admitted that Simon played smart and the affable French man, who became a crowd favourite, too endorsed their view.
"To understand what is happening on the court is always my strength. As long as I stay calm and cool and which I did all the week and thats why I could perform on that level."
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Someone who has beaten greats of the game, Roger Federer and Rafael Nadal, Simon controlled the match with his incredible retrieving skills and mixed up the pace in serve to surprise his rival.
Asked if he changed anything in his game to get the better of the tall South African, Simon nodded but did not elaborate.
"Yes, I changed a few things but I wont tell you because he does not have to know. I made small adjustments. His serve is like his that I have to find a magic trick to return every time, so you just try to jump on the board and try.
"My serve was great. Yes, I was changing and mixing the pace on my serve and it was pretty effective. I wish I could serve like him and hit it every corner but thats what I cant do, so I try find a way to start the point well in a different way, he said.
"Yes I must say. It was helping a lot because they have some similarities to their game. Kevin is even serving better than Marin. Its terrible to return but it was more so about the rallies from the baseline, they like to hit a lot, they play at a high pace, so yes playing Marin before Kevin was helping a lot," Simon said.
Simon said he did not expect to reach both the singles and doubles final in the first tournament of the season.
"So something happened during the week. I felt like home. I was hoping to play one in final, in singles. I have never won two doubles matches in a row, it never happened. So it was a great surprise."
Talking a about the 39-shot rally on the set point in the tie-break, Simon said, "My heart rate was like 260. I was happy he could not move on the last forehand. It was very important. It was a point when there was lot of pressure," he added.
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