"A crazy, crazy final. A lot of intensity on every single point from the very beginning. I'm just really proud of the work we did throughout the whole year," said Garcia.
"In this great match, I really went for it and I'm really, really happy to have won my biggest title."
Garcia has credited a change in attitude for her success this season, explaining how she has worked hard to avoid succumbing to negative emotions during matches.
That was evident during her battles in Fort Worth this week, where she stayed positive throughout.
Garcia is 4-0 in finals this season and has won 11 of the 14 tour-level finals she has reached - a testament to her ability to step up in big matches.
"Obviously all year long gave me a lot of confidence for this tournament, for this week, for today," said the 29-year-old.
"I think the experience of the semi-final of the US Open helped me a lot. Obviously Ons [Jabeur] played a really good match, she was really solid, she made it uncomfortable for me to play my game, but I was really sad and disappointed about my performance. I really thought I could do better.
"After so many great matches, I was like, Yeah, that was bad.
"I really tried to be here in the WTA Finals and enjoy every moment, to go for it, to try the best I can; my game style maybe it was going to pay off, maybe not, but at least I would have no regrets. I really felt better and more confident every day and the last two matches I was really solid."