Big-serving John Isner overpowered world number one Novak Djokovic to reach the final of the BNP Paribas Open tournament, being held at Indian Wells, California, USA with a 7-6 3-6 7-6 upset in the last four. The 26-year-old American blasted a total of 20 aces past the top-seeded Serb, the last of them a 135 kilometer peer hour serve to clinch the final-set tiebreak 7-5 and end the match after two hours, 45 minutes.Isner, who had lost to Djokovic in their previous two meetings, threw his arms skywards in celebration before light drizzle began to fall on the showpiece stadium court at the Indian Wells Tennis Garden.