Yang Tsung-hua will not get much adulation or even recognition for his performance this weekend in Taiwan's Asia/Oceania Group I Davis Cup relegation playoff victory against the Philippines in Kaohsiung - but he should. After winning a tough singles match on Friday and teaming with Yi Chu-huan to win a crucial four-setter in doubles Saturday, the fatigued 19-year-old gave Taiwan an unassailable 3-1 lead in the best-of-five tie Sunday by gutting out a 2-6, 6-3, 6-2, 3-6, 6-3 victory against crafty veteran Cecil Mamiit. I was really tired in the fifth set, but so was he (Mamiit) because he had also played three straight days. My willpower got me through that last set, Yang told the Central News Agency after completing the first five-set match of his young career and withstanding the pressure of carrying his team in Davis Cup for the first time. With Taiwan's top player Lu Yen-hsun not playing Davis Cup this year, Jimmy Wang still not fully recovered from a wrist injury, and veteran Chen Ti fighting inconsistency and injuries, it was up to Yang to play a primary role in keeping Taiwan in Asia/Oceania Group I, just one notch below the World Group - the highest echelon of Davis Cup. Taiwan lost its first round encounter to Australia 5-0, and needed to beat the Philippines to avoid a final showdown against South Korea in September for relegation to Group II. Yang, who only turned pro this year and whose ranking rose inside of 300 (No. 295) for the first time this past week, admitted to feeling some pressure this weekend, before his instincts took over. I felt nervous before my matches, but once I was out there, I didn't think about anything and I got plenty of encouragement from the coach,Yang said. In Sunday's singles, Yang still showed he has plenty to learn about the pro game, admitting to having trouble with the changes of pace thrown at him by the 34-year-old Mamiit in the fourth set -I had trouble picking up his shots- but Yang was able to impose his will in the final set to propel Taiwan to victory. Yang does not intend to vie for a spot in the final grand slam of the year - the U.S. Open - this year, preferring to build his game and play second tier ATP Challengers to pick up ranking points. He felt his Davis Cup performance will have a positive impact on his future. I think the Davis Cup has really helped me with my confidence and gaining experience, and has prepared me better for my pro career, Yang said. The victory over the Philippines meant Taiwan's 2010 Davis Cup campaign is over, but it has also given Yang some confidence for Taiwan's chances next year. If Lu plays Davis Cup, I think we have a shot at reaching the World Group playoffs,Yang said. Taiwan has come close but failed to get a chance to challenge for a spot in the World Group by reaching the World Group playoffs since ascending to Asia/Oceania Group I in 2004. Australia and Kazakhstan are the two countries that qualified for the World Group playoffs from Asia/Oceania Group I this year. In the final singles match of the Taiwan-Philippines tie Sunday, Taiwan's Lee Hsin-han defeated the Philippines' Ruben Gonzales 6-3, 6-0 to complete Taiwan's 4-1 victory. 