ROME — Elina Svitolina and Alexander Zverev could hardly be more convincing at the tour level.

Svitolina, ranked fourth, defended her Italian Open title Sunday with a 6-0, 6-4 win over No. 1 Simona Halep. The win improved her record in finals to 12-2, having won eight in a row. It was her sixth consecutive win in matches against a WTA No. 1, having beaten Halep twice, Angelique Kerber three times, and Serena Williams once. Svitolina dominated Halep in the final, especially in the first set, in which she dropped only eight points.

Zverev, ranked No. 3 and also a defending champion here, carried a 13-match winning streak into the men’s final after titles in Munich and Madrid. He appeared on the verge of stunning top-seeded Rafael Nadal, reeling off nine of 11 games in the middle of the match before succumbing to a 6-1, 1-6, 6-3 defeat as Nadal became champion here for the eighth time and reclaimed the ATP No. 1 ranking from Roger Federer.

Both Svitolina and Zverev, however, have much still to prove in the sport’s marquee moments.

For Svitolina, 23, a Grand Slam title feels inevitable and perhaps overdue. But when the M.C. of the trophy ceremony suggested that she could repeat her success in Rome by making the final of the upcoming French Open, Svitolina gave a short, nervous laugh.

“It’s still so, so far,” she said. “I try to take one match at a time, that’s very important. In a Grand Slam, it’s very tricky, so, you know, we’ll see how it goes. But I’m definitely going to enjoy Roland Garros on this high note.”