The world number one took just an hour and 10 minutes to wrap up an emphatic 6-2 6-1 victory at the Foro Italico.
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The world number one lifted a record 36th Masters crown, one more than great rival Rafael Nadal, after beating Diego Schwartzman 7-5, 6-3 in the final at the Foro Italico in Rome.
World number two Halep, 28, was competing in her third Rome WTA final, having finished runner-up in 2017 and 2018 on the clay at the Foro Italico.
Pliskova, the second seed, beat fellow Czech Marketa Vondrousova 6-2, 6-4 in the semi-finals of the final warm-up tournament on clay before the French Open.