The Czech number seven Pliskova won in one hour and 25 minutes in Rome with 6: 3: 6: 4 for their second season title.
The 28-year-old Konta beat two top 10 players to reach the final and prevailed at the French Open on 26 May. “I am very pleased with how I developed and improved in each game this year,” said Konta.
“This is my second biggest final to Miami, which is a big moment for me and I am very pleased to make that progress.”
Konta was the first British woman to reach the final of the Italian Open since Virginia Wade in 1971, and Pliskova is the first Czech woman to win it since 1978.
Konta did not recover from a defeat in their opening game and again from a 3: 3 in the second round.
Pliskova needed three match points to secure the win and claim her first title since Brisbane International in January. Pliskova was the sharper player, allowing Konta to look at just one point of interruption.
The serve remains the foundation of Pliskova’s game, but she has become a very accomplished clay court player and will be the second seed at the French Open.
Konta could not reproduce the breathtaking shape she found at the beginning of the tournament, but what a week – a season change week.
It will no longer be at the mercy of the draw for the French Open, and almost certainly Wimbledon as well. As a seed she can not play in the top 32 in the world until at least the third round.
Konta’s tour results before April were unspectacular, but she now occupies the 13th place in the annual ranking race. And she has also won six Fed Cup games for her country, which are not taken into account.