 Doi continued to gain rank in 2007, and formed a regular tag team with Masato Yoshino, known as Speed Muscle, an amalgamation of their respective nicknames "Speed Star" and "Bosou Muscle".Doi and Yoshino declared themselves the first Open the Twin Gate Champions after winning the inaugural Summer Adventure Tag League Tournament in June, and later defeated Taku Iwasa and Kenichiro Arai for the I-J Heavyweight Tag Team Championship to unify the two belts.In November, Doi and Yoshino added the GHC Junior Heavyweight Tag Team Championship to their collection.