Iga Swiatek says she has been in shock since winning the French Open, and is now aiming to win the other three Grand Slams titles and an Olympic medal.
The 19-year-old beat Sofia Kenin in Saturday's final to become the lowest ranked women's champion at Roland Garros.
"Basically I was in shock for the next three days," Swiatek told BBC Sport shortly after her return to Poland.
"I couldn't tell you my emotions, because even I don't understand them."
She added: "It's pretty crazy here. I feel like my life changed completely and I'm trying to get used to that.