Vietnam Open: Ajay Jayaram, Rituparna Das and Mithun Manjunath enter quarter-finals

File image of Ajay Jayaram. AFP[/caption]The 30-year-old had reached the finals at the White Nights last month and ended a runner-up at the Korea Open Super Series in 2015.Former national champion Rituparna beat Chinese Taipei's sixth seed Sung Shuo Yun 21-8, 21-14 to set up a meeting with Thailand's Phittayaporn Chaiwan next.Young Manjunath, who had reached the semifinals at the Russian Open last month, staved off a stiff challenge from Thailand's Adulrach Namkul 18-21, 21-13, 21-19 in a 56-minute clash.He will face China's Zhou Zeqi next.However, it was curtains for Kartik Jindal after he lost 10-21, 22-24 to Canada's Xiaodong Sheng.Up against Coelho, who had defeated HS Prannoy in the World Championship last week, Jayaram opened up a 6-1 lead before managing a 11-8 advantage at the interval.After the breather, Coelho turned the tables, leading 12-11 but Jayaram again grabbed the advantage to lead 16-13. The Brazilian caught up at 20-20 before the Indian reeled off the required two points to pocket the first game.In the second game, Jayaram came out firing on all cylinders, leading 5-1. He soon jumped to a 13-5 lead and even though Coelho reduced the deficit to 13-14, Jayaram held his fort to eventually shut the door on his rival.