Vardhan and Matsui pipped Russia's Evgeny Karlovskiy and Evgeny Tyurnev 7-6(3) 6-7(5) 10-7 in a tight final of the President's Cup in Astana, Kazakhstan
Vardhan and Matsui saved three of the four breakpoints they faced in the summit clash, which lasted one hour and 44 minutes. The win got Vardhan the biggest title triumph of his career.
Vardhan had won Fergana title last month with compatriot N Sriram Balaji and had ended runner-up in Samarkand with Prajnesh Gunneswaran.
"It has been an incredible week, it is the biggest title so far of my career after a bad injury lay-off in 2013 and 2014. I am really happy to be back at this level," Vardhan told PTI from Astana.
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"Last week, me and Matsui lost in the first round of an ITF event, having six match points. But we kept our head high and worked together for a fortnight," he added.
Vardhan credited former national champion Ashutosh Singh, who is now a coach, for helping him with his game.
Meanwhile, veteran Paes and his partner Sam Groth made a semifinal exit from the ATP 250 Hall of Fame Open in Newport (USA), following a 6-4 6-7(6) 9-11 defeat to Pakistan's Aisam ul-haq Qureshi and America's Rajeev Ram.
Losing the quarterfinal of the same event was the Indian pair of Divij Sharan and Purav Raja. They lost 6-7 (5) 6-7 (4) to the Australian team of Matt Reid John-Patrick Smith in Newport.