John Isner ends Juan Martin Del Potro's 15-match winning streak to reach Miami Open final

Juan Martin del Potro returns to John Isner during a semifinal match at the Miami Open. | AP

John Isner returns to Juan Martin del Potro during a semifinal match at the Miami Open. | AP

Juan Martin del Potro hits a forehand to John Isner during a semifinal match at the Miami Open. | AP

John Isner wasted no time in breaking Juan Martin del Potro and racing into a 3-0 lead while sending down five aces on his own serve to brilliantly wrap up the first set in just 27 minutes. | AP

Juan Martin del Potro wipes his face during a semifinal match against John Isner at the Miami Open. | AP

John Isner won an impressive 83 percent of points on his second serve, reached his fifth ATP Masters final. | AP

Juan Martin del Potro returns to John Isner during a semifinal match at the Miami Open. | AP

John Isner, right, and Juan Martin del Potro embrace at the net after their semifinal match at the Miami Open. | AP

John Isner celebrates after defeating Juan Martin del Potro 6-1, 7-6 (2) in a semifinal match at the Miami Open. | AP