Novak Djokovic sets up Andy Murray showdown in Miami while Rafael Nadal pulls out with knee injury It only delayed the inevitable, though, as the defending champion sealed his progress on his second match point. "As I did yesterday in the quarter-finals, I started very strong, just going for the shots, being very aggressive," Djokovic said. Then I just wasn't able to close it out. It was a very similar match to the one against Ferrer. It was [an] exciting match I think for us to play and for the crowd. I didn't expect an easy match and [I'm] just happy to be through. Nadal, meanwhile, revealed he pulled out of his semi-final against Murray because he did not want to "lie to everybody." The world No 2 fell foul of his long-suffering knees in Miami, this time his left one, handing Murray a free pass. Nadal still opted to face the media, though, and admitted he made the decision, albeit just two hours prior to the start of the match, in the interests of honesty. I waited until today in the morning. I did a lot of treatment yesterday," he said. But I am not ready to compete today. I am very sorry for the fans. I'm very sorry for the tournament. I'm very sorry for everybody who was ready to watch the match on television. I cannot go on court and lie to everybody. Murray was disappointed not to be able to put his game plan, worked out with coach Ivan Lendl, to the test. "Every time you play against one of the top guys in the world, it's always a good opportunity to see where your game's at," he said. I have been working with Ivan now for a couple of months, on certain tactics that would work against Rafa, Novak and Roger [Federer]. It would have been nice to see whether or not those things were working. Murray will get the chance to try out some of those tactics as he faces Djokovic for the third time this season in Sunday's final. Djokovic beat the Scot in five sets in the Australian Open semi-final on his way to claiming the Melbourne crown, but Murray got his revenge at the same stage in Dubai.