If we have to look only at numbers, Karolina Pliskova played the best season of her career. The Czech won four titles (a record) and she played her first final in a Premier WTA.
These premises make us understand how profitable Pliskova's season was.
With her victories, she got fifteen career titles and in 2019 she played a total of five finals (only in 2015 she played six finals). Pliskova also played for the first time in career the semi-final at the Australian Open, losing against the eventual champion Naomi Osaka.
She also got the final of the Miami Open, losing to Ashleigh Barty and the semifinal of the WTA Finals, still losing to Barty. For the first time in her career, Pliskova won three titles on three different surfaces, also considering the grass-courts of the Nature Valley International in Eastbourne and the clay-courts of the Rome Open (her second WTA Premier in career).
Thanks to these results, Karolina closed the season at the second place of the WTA Ranking, behind Ashleigh Barty. Considering the excellent performances and the fine results, it remains the regret for Wimbledon and for the US Open.
In both Slams, she played well but she never went beyond the fourth round. And both in London and in New York she would have had great chances to aspire at least to a place in the final, considering the surface is perfect for her tennis.
In 2020, she will have to further improve her ambitions, targeting the new goals in the Slams and in the Premier Mandatory tournaments: Pliskova is a great champion but she still has to get a prestigious victory and 2020 could be the right year.