PARIS: World number one Novak Djokovic will lock horns with defending champion Rafael Nadal in the semi-finals of the ongoing French Open on Friday.Djokovic on Wednesday (local time) defeated ninth-seeded Italian Matteo Berrettini 6-3, 6-2, 6-7(5), 7-5 in the quarter-finals to book the semi-final berth. The Serbian tennis player started off well as he won the first two sets quite easily but Berrettini came back in the third set.However, Djokovic made the most of every opportunity converting four of nine breakpoints and saved all three break points in the fourth set to register a win. As a result, it took more than three hours to overcome his ninth-seeded opponent.Djokovic and Nadal will lock horns for the 58th time and it will be their ninth face-off in Paris.Nadal had defeated Argentina’s Diego Schwartzman 6-3, 4-6, 6-4, 6-0 in the quarterfinals.The 35-year old was at his prime best and carrying on with his winning momentum, Nadal did not let up and he went on to win the match.