Yusei Kikuchi

On January 2, 2019, Kikuchi signed a four-year contract with the Seattle Mariners. Kikuchi made his MLB debut on March 21, 2019, going 4.2 innings while allowing 2 runs (1 earned) and striking out 3. He is the first Japanese-born player to make his MLB debut in Japan. Kikuchi struggled in his first season with Seattle, going 6–11 with an ERA of 5.46 in 32 starts. He struck out 116 in ​161  ⁄3 innings.

In 2018, Kikuchi was selected for the 2018 NPB All-Star game [jp] .

On December 3, 2018, Seibu announced it was allowing Kikuchi to enter the posting system to play in Major League Baseball (MLB), with the 30-day period starting a month later.

After the 2011 season, Seibu announced that Kikuchi would join the Melbourne Aces of the Australian Baseball League (ABL).

As a high school pitcher, Kikuchi had a fastball that was clocked at 154 km/h (96 mph) in 2009. In October 2009, Kikuchi sparked controversy when it was announced that he was considering bypassing the amateur draft in Japan for the NPB and signing with an American Major League Baseball club. Under Major League Baseball's current rules, Kikuchi would not have been subject to the MLB Draft and instead be declared a free agent, free to sign with any American team he wanted. The Texas Rangers were one of several teams interested in signing Kikuchi, as well as the Boston Red Sox. Japanese news service reports also identified scouts from the Los Angeles Dodgers, Seattle Mariners, New York Mets, Cleveland Indians, Chicago Cubs, San Francisco Giants, Detroit Tigers, Atlanta Braves and New York Yankees watching Kikuchi in tournaments. All 12 NPB teams were also reportedly interested in signing the pitcher.

Hanamaki Higashi manager Hiroshi Sasaki submitted paperwork to the high school baseball federation in Iwate Prefecture on Kikuchi's behalf, stating his desire to turn pro. The move opened the way for professional teams to make contact with Kikuchi in a race to secure his services. With the submission of the paperwork, Kikuchi was open to be named in the Japanese baseball draft, which began on October 29, 2009. He was expected to be named as a No. 1 draft pick by several Japanese clubs. NPB had asked that Kikuchi not receive an offer from any major league clubs before Japan's draft, in order to even the chances for Japanese teams, who are not allowed to make offers before the draft. Kikuchi helped Hanamaki Higashi to a runnerup finish at the national high school invitational in April and to the semifinals in the national championship in August. Kikuchi had reportedly expressed a preference to play in the United States and even visited in October.

On November 20, 2009, Kikuchi signed a pro deal with the Saitama Seibu Lions; the deal included a 100 million yen (about $1 million) signing bonus, a 15 million yen ($150,000) first year salary, and 50 million yen ($500,000) in performance bonuses.

Yusei Kikuchi (菊池 雄星 , Kikuchi Yūsei, Japanese pronunciation: [kʲi̥kɯ̹t͡ɕi̥ jɯ̹ːse̞ː] , born June 17, 1991) is a Japanese professional baseball pitcher for the Seattle Mariners of Major League Baseball (MLB). Kikuchi formerly played for the Saitama Seibu Lions of Nippon Professional Baseball's Pacific League.