In 2005, Soeda won two Futures tournament in Japan and Sri Lanka, and he made his debut in an ATP World Tour event in Ho Chi Minh City, losing to top seed Mariano Puerta in the first round.

Go made his first Grand Slam main-draw appearance at the 2007 Australian Open in January and lost to ninth seed Mario Ančić in the first round.

In September, he beat wildcard Bai Yan in the China Open first round to record his first ATP main-draw win.

In October 2009, Soeda earned his sixth Challenger title in Tiburon by beating Ilija Bozoljac in the final.

At the Wimbledon Championships, he received entry from a lucky loser spot, but lost to eventual semifinalist Jo-Wilfried Tsonga.

In the Asian swing, Soeda reached his first quarterfinal of an ATP World Tour event at the Thailand Open, beating Karol Beck and Tobias Kamke.

He beat Frederico Gil and fifth seed Ivan Dodig respectively to reach the quarterfinals, and he upset defending champion Stan Wawrinka in straight sets.

Then he was into the Wimbledon Championships and advanced to the second round of a Grand Slam for the first time, beating Igor Kunitsyn in straight sets.

He defeated Evgeny Donskoy and Prakash Amritraj in the first two rounds, but he lost to eventual champion Janko Tipsarević.

Following this event, Soeda successfully defended his title in the Maui Challenger, defeating Mischa Zverev in the final, and he reached the second round in Delray Beach by beating Marinko Matosevic in three sets.

Soeda bounced back from a first-round loss in the French Open by qualifying for the Wimbledon Championships without losing a set, and he beat Andreas Haider-Maurer to reach the second round for two consecutive years in this event.

In the Asian swing, Soeda reached the second round in the Thailand Open, beating fellow qualifier Santiago Giraldo.

[10] After winning another Challenger title in Seoul, he was into the main draw at the French Open and Wimbledon Championships, but he faced seeded players in the first round, losing to Philipp Kohlschreiber and John Isner.

During the American hard-court season, Soeda made it into the quarterfinals in Atlanta, knocking out Alexandr Dolgopolov and fourth seed Adrian Mannarino on the way, but was beaten by Gilles Müller.

[11][12] Soeda made his Davis Cup debut for Japan in 2005, Asia/Oceania Zone Group I relegation play-offs against Thailand.

In the first round of 2012 Davis Cup World Group against Croatia, Soeda faced Ivan Dodig in the first singles rubber and defeated him in a 4 hour, 5 minute match.

He lost to Santiago Giraldo in five sets, but defeated Alejandro Falla in the deciding rubber to put Japan back in the World Group for 2014.

As noted by commentator Nick Lester in the BB&T Atlanta Open, Soeda plays a conventional style of tennis, approaching and finishing points at the net when possible.

[15] Eric Taino Lleyton Hewitt Denis Istomin Vasek Pospisil Todd Widom Woong-Sun Jun Toshihide Matsui David Martin Martin Slanar Bobby Reynolds John-Patrick Smith Michael Venus Jordan Thompson Chu-Huan Yi Jackson Withrow Vijay Sundar Prashanth Jordan Thompson Akira Santillan Current through the 2022 Cincinnati Masters.

Only ATP Tour main draw, Davis Cup and Olympic matches are considered: Active players are in boldface.