Juan Martin Del Potro. Pic/AFP

Juan Martin del Potro raised the roof as he came from behind to beat Milos Raonic 5-7, 7-6 (7/1), 7-6 (7/3) and power into a Miami Open semi-final clash with American John Isner. Roared on by a partisan crowd, del Potro rallied after losing the first set to finally wear down the Canadian in two hours and 53 minutes of relentless drama. There was little difference between these two big hitters, but it was the Argentine who held his nerve when it counted to book a last-four encounter with Isner on Friday. "I love to play in matches like this," a visibly weary del Potro said after his 15th straight match win. "We both played well, the difference was perhaps that I just played better in the tie-breaks. "I am tired now, but at least I have a day off to prepare for Friday.