Madrid, April 18 -- The Madrid Open is losing some star power with Carlos Alcaraz joining Novak Djokovic in pulling out of the upcoming clay-court tournament. Alcaraz, ranked No. 2, withdrew from the Barcelona Open in midweek after undergoing a test on his right wrist, and the fourth-ranked Djokovic is nursing a shoulder injury. On Friday, Alcaraz said it "hurts" to announce that he'll miss the Madrid Open for a second straight year. The tournament starts on Monday. Alcaraz's withdrawal in Barcelona came a day after he called for a trainer and had his wrist treated during his opening match, a 6-4, 6-2 victory over Otto Virtanen. Three-time winner Djokovic hasn't competed since the Indian Wells Masters. He missed the Miami Open because of a right shoulder injury and also skipped the Monte Carlo Masters....