Eri Yoshida play in the Golden Baseball League, the major independent minor league in western North America, by the Chico Outlaws. The Outlaws were managed by former major league all-star Garry Templeton and the team president and general manager was former Los Angeles Dodgers outfielder Mike Marshall. On March 2, 2010, she trained with Tim Wakefield at the Boston Red Sox minor league training facility. On April 8, 2010, she signed the contract with the Chico Outlaws and became the first female professional baseball player in the U.S. since the retirement of Ila Borders 10 years previously, and the first ever to
Chico Outlaws in major league history in hit a grand slam in his first at bat as he went deep to centerfield on the first pitch thrown to him. On June 1, 2010, Eri Yoshida, a 5 foot, 1 inch female knuckleball pitcher from Japan, pitched for the Outlaws. The Outlaws made history and defied the odds to sweep the Calgary Vipers to win the GBL North Division Title, then sweep Na Koa Ikaika Maui to capture their second GBL Championship in 2010, becoming the first team in league history to accomplish that feat, as well as going undefeated in the playoffs.