PARIS—Rafael Nadal’s French Open set streak is over. His pursuit of a record-breaking 21st Grand Slam title—including 14 at Roland Garros—remains very much intact. Nadal shrugged off dropping a set in Paris for the first time in two years and regained control Wednesday, whipping violent forehands punctuated with first pumps and yells of “Vamos!” en route to a 6–3, 4–6, 6–4, 6–0 victory over 10th-seeded Diego Schwartzman to reach the semifinals at the clay-court major tournament. After taking the last nine games against Schwartzman, No. 3 seed Nadal will play in Friday’s semifinals against either No. 1 Novak Djokovic, in what would be a rematch of last year’s final and their 58th meeting anywhere, or No. 9 Matteo Berrettini. The Djokovic-Berrettini quarterfinal was scheduled for Wednesday night. The other men’s semifinal will be No. 5 Stefanos Tsitsipas vs. No. 6 Alexander Zverev. Nadal, who turned 35 last week, is now …