Rain-interrupted play at the Rome Masters was set to resume on Saturday after heavy downpours and storms in the Italian capital.

Organisers called a halt to proceedings late on Friday as Serbian second seed Novak Djokovic, a four-time champion, took a one-set lead over quarter-final opponent Juan del Potro of Argentina.

Their match was stopped after Del Potro took a 2-1 lead in the second set.

Despite thunderstorms and heavy rain throughout the night the bad weather finally abated at midday (1000 GMT), prompting organisers to announce: "We're working hard to start as soon as possible."

First up is a women's semi-final between Romanian sixth seed Simona Halep and Dutchwoman Kiki Bertens, seeded 15.

The second women's semi will see Spain's number three seed and reigning French Open champion Garbine Muguruza face Ukrainian eighth seed Elina Svitolina.

The first men's semi-final is between 20-year-old German starlet Alexander Zverev and big-serving American John Isner.

Austria's Dominic Thiem, who sent seven-time champion Rafael Nadal crashing out in their quarter-final, is set to face the winner of the Djokovic-Del Potro quarter-final later in the day.