TOKYO (Reuters) World number one Rafa Nadal saved two match points to beat Serbias Viktor Troicki 7-6 4-6 7-6 and reach the final of the Japan Open on Saturday. The Spaniard will play Frenchman Gael Monfils in Sundays final of the $1.2 million Tokyo tournament after the fifth seed overpowered Czech Radek Stepanek 6-3 6-3. Nadal took a tight first set on a tiebreak 7-4 with two thunderous forehands but was broken at the start of the second after some aggressive play from the risk-taking Troicki. The Serb went on to the level the match and had Nadal on the ropes at 6-5 but this years triple grand slam winner dug deep to force another tiebreak. Nadal saved another match point and took the breaker 9-7 to advance to the final with a heavy forehand that the 54th-ranked Troicki could not control. I lost my concentration after the first set, Nadal told reporters. Its a long season and there is a lot of pressure so its easy to lose your concentration. Monfils had no such trouble against Stepanek a day after knocking out second seed Andy Roddick. Im very motivated, said the beanpole Frenchman. I know its going to be hard against Nadal but if I have a small opportunity I will take it. Im playing better and better. I change my game every day. Some days Im defensive, some days Im aggressive.