She would beat a former Grand Slam champion, Sam Stosur, a former world No1 Caroline Wozniacki, the reigning Olympic champion Monica Puig, and would finally deny the woman who could claim the top ranking for the first time if she won the title, Simona Halep.
Ostapenko's beaming smile as she raised the Coupe Suzanne Lenglen was the only thing sunnier than her strokes all fortnight.
Halep encountered her first tough fight in the tournament, against Elina Svitolina in their quarter-final when she trailed 1-5 in the second set.
Not only did the third seed fall short in the Roland Garros final for the second time, but defeat also cost her the world number one ranking that would have come with victory.
Jelena Ostapenko is confident she can take the attention in her stride as she targets more grand slam success at Wimbledon. The 192-metre vertical drop is not for the faint-hearted and had her mother not intervened, Jelena Ostapenko would have joined the hundreds of people who have leapt off the tallest man-made structure in New Zealand.
"Nobody taught me. It's just the way I play".
The newly turned 20-year-old trailed by a set and 3-0 - she had to fend off three break points to avoid falling behind 4-0 - before rallying for a 4-6 6-4 6-3 victory Saturday on Philippe Chatrier court. She was hitting very strong.
A fortunate net cord gave her the crucial break of serve at 3-3, prompting Halep's coach Darren Cahill to look to the sky in disbelief, but the Latvian was on a roll.
At such a young age the Riga-born star showed fantastic maturity to go all the way on the clay and her attack-minded play, which saw her hit 54 winners in the final and 299 across the entire tournament, has made her a fans' favourite already.
The problem for the 2014 Wimbledon junior champion, however, was that she was missing too much in the first set.
"Of course, I would like to win probably all of the Grand Slams". Because of all the awesome things she acheived in the span of one tournament, there's no reason to think she can't make a deep run, and possibly get another win, at the All England Club when Wimbeldon commences in less than a month.
"It was always my goal to win a Grand Slam title, now I want to win them all", she said. She stormed to the last five games, officially winning her first grand slam title by crushing a backhand return victor down the line.
"I think nobody [taught] me", she said.
Prior to her exploits in Paris, Ostapenko's professional earnings stacked up to just over $1.2million. Perhaps she will feel more at home on the hard courts later in the summer.
She has only previously reached the second round, but, having overcome such long odds at the French Open, she will be full of confidence heading into the competition.
"When I was in Auckland I really wanted to jump from the tower but my mum really did not want me to do it because she felt it was kind of risky".
When the disappointment fades, she will remember that she played a solid tournament for six-plus matches. Three years ago it was something new.
"Actually, yeah, I think it's a quite bit deal in Latvia".
After telling herself to calm down on multiple occasions, Ostapenko started finding her range in the second set.
"I can't believe I am the French Open champion at just 20".