2 WTA Tour Titles
In 2018 Karolína won 2 WTA Tour singles titles. She triumphed in Stuttgart and Tokyo.
Third Consecutive WTA Finals Appearance
Karolína played at the WTA Finals in Singapure for the third consecutive time and was the only player with this achievement in 2016, 2017 and 2018. During her third appearance she reached the semifinals where she lost to Sloane Stephens in three sets.