Please answer the following question: Information: - The Oakland Athletics (often abbreviated to A's) are an American professional baseball team based in Oakland, California. The Athletics compete in Major League Baseball (MLB) as a member club of the American League (AL) West division. The club plays its home games at the OaklandAlameda County Coliseum. The club has won nine World Series championships, the third most of all current Major League Baseball teams. - In baseball (hardball or softball), a starting pitcher or starter is the first pitcher in the game for each team. A pitcher is credited with a game started if they throw the first pitch to the opponent's first batter of a game. A pitcher who enters the game after the first pitch of the game is a relief pitcher. Starting pitchers are expected to pitch for a significant portion of the game, although their ability to do this depends on many factors, including effectiveness, stamina, health, and strategy. - In baseball, the pitcher is the player who throws the baseball from the pitcher's mound toward the catcher to begin each play, with the goal of retiring a batter, who attempts to either make contact with the pitched ball or draw a walk. In the numbering system used to record defensive plays, the pitcher is assigned the number 1. The pitcher is often considered the most important defensive player, and as such is situated at the right end of the defensive spectrum. There are many different types of pitchers, such as the starting pitcher, relief pitcher, middle reliever, lefty specialist, setup man, and closer. - Jason Aaron Hammel ( born September 2 , 1982 ) is an American professional baseball pitcher for the Chicago Cubs of Major League Baseball ( MLB ) . He has also pitched in MLB for the Tampa Bay Devil Rays / Rays , Colorado Rockies , Baltimore Orioles , and Oakland Athletics . - Catcher is a position for a baseball or softball player. When a batter takes his/her turn to hit, the catcher crouches behind home plate, in front of the (home) umpire, and receives the ball from the pitcher. In addition to this primary duty, the catcher is also called upon to master many other skills in order to field the position well. The role of the catcher is similar to that of the wicket-keeper in cricket. - The Baltimore Orioles are an American professional baseball team based in Baltimore, Maryland. The Orioles compete in Major League Baseball (MLB) as a member of the American League (AL) East division. One of the AL's eight charter franchises when the league was established in 1901 with President Ban Johnson, this particular franchise spent its first year as a major league club in Milwaukee, Wisconsin as the Milwaukee Brewers before moving to St. Louis, Missouri to become the St. Louis Browns. After 52 often-beleaguered years in St. Louis, the franchise was purchased in November 1953 by Baltimore business interests led by Clarence Miles. The franchise officially moved to Baltimore for the 1954 season and adopted the historic "Orioles" name in honor of the official state bird of Maryland. The Orioles name had also been used by several previous major and minor league baseball clubs in Baltimore, including the franchise that would eventually become the New York Yankees. Nicknames for the team include the "O's" and the "Birds". - Milwaukee is the largest city in the state of Wisconsin and the fifth-largest city in the Midwestern United States. The county seat of Milwaukee County, it is on Lake Michigan's western shore. Milwaukee's estimated population in 2015 was 600,155. Milwaukee is the main cultural and economic center of the MilwaukeeRacineWaukesha Metropolitan Area with an estimated population of as of 2014. Ranked by estimated 2014 population, Milwaukee is the 31st largest city in the United States. - At the end of each Major League Baseball season, the league leaders of various statistical categories are announced. Leading the league in a particular category is referred to as a "title". - In baseball and softball, a relief pitcher or reliever is a pitcher who enters the game after the starting pitcher is removed due to injury, ineffectiveness, fatigue, ejection, or for other strategic reasons, such as being substituted by a pinch hitter. Relief pitchers are further divided informally into various roles, such as closers, set-up relief pitchers, middle relief pitchers, left/right-handed specialists, and long relievers. Whereas starting pitchers usually rest several days before pitching in a game again due to the number of pitches thrown, relief pitchers are expected to be more flexible and typically pitch more games but with fewer innings pitched. A team's staff of relievers is normally referred to metonymically as a team's bullpen, which refers to the area where the relievers sit during games, and where they warm-up prior to entering the game. - Oakland is the largest city and the county seat of Alameda County, California, United States. A major West Coast port city, Oakland is the largest city in the East Bay region of the San Francisco Bay Area, the third largest city overall in the San Francisco Bay Area, the eighth largest city in California, and the 45th largest city in the United States, with a population of 419,267 . It serves as a trade center for the San Francisco Bay Area; its Port of Oakland is the busiest port in the San Francisco Bay, the entirety of Northern California, and the fifth busiest in the United States. The city is located east of San Francisco. Oakland was incorporated in 1852. - Baseball is a bat-and-ball game played between two teams of nine players each, who take turns batting and fielding. Given the information, choose the subject and object entities that have the relation of 'position played on team / speciality'.
Answer:
jason hammel , starting pitcher