力皇猛
On March 1, 2003, Kobashi defeated his rival Mitsuharu Misawa in a match for the GHC Heavyweight Championship. Kobashi's reign spanned for over two years and included 13 successful defenses. Notable defences included: against Masahiro Chono at New Japan's May 2, 2003, Tokyo Dome event, against Yuji Nagata on September 12, 2003, against Yoshihiro Takayama on April 25, 2004, and against Jun Akiyama in the main event of Noah's first Tokyo Dome show on July 10, 2004. During his reign he won the Wrestling Observer Newsletter's Wrestler of the Year award in both 2003 and 2004. In March 2005 he finally lost the championship to Takeshi Rikio. Despite the loss of his title Kobashi remained Noah's top wrestler, the rest of the year was highlighted by matches with outsiders such as Genichiro Tenryu and Kensuke Sasaki (the latter on July 18, 2005 in the Tokyo Dome), and in the following year he had praised matches against junior heavyweights such as KENTA (March 5, 2006) and Naomichi Marufuji (April 23, 2006). Kobashi holds the distinction of having competed in a total of 23 5-Star Matches as rated by Dave Meltzer of the "Wrestling Observer", second only to his long-time rival, Misawa.