Casey Patrick Kelly (born October 4, 1989) is an American professional baseball pitcher in the San Francisco Giants organization.
 He was a first-round draft choice, 30th overall, in the 2008 Major League Baseball Draft by the Boston Red Sox.
 He was the top minor league prospect in the Red Sox organization when he was acquired by the San Diego Padres after the 2010 season, along with three other prospects, in exchange for All-Star player Adrian Gonzalez.
 He made his major league debut with San Diego in 2012, but underwent Tommy John surgery the following year.
 He was traded to Atlanta after the 2015 season.
On December 4, 1990, the Padres traded second baseman Roberto Alomar and outfielder Joe Carter to the Toronto Blue Jays in exchange for first baseman Fred McGriff and shortstop Tony Fernández.
 Blue Jays GM Pat Gillick and Padres GM Joe McIlvaine originally talked about just trading Joe Carter for Fred McGriff.
 The Padres were losing Jack Clark and needed a new first baseman.
 The Blue Jays had John Olerud ready to take over at first base but were losing outfielder George Bell.
 Gillick decided to up the ante by trying to get Roberto Alomar.
 Gillick figured that with Garry Templeton in the twilight of his career, Fernández would be an adequate replacement.
 Alomar feuded with Padres manager Greg Riddoch and the thinking was that Bip Roberts and Joey Cora could platoon at second base.
 Alomar and Carter would go on to help the Toronto Blue Jays win the 1992 World Series and 1993 World Series.
John Edward Roskos (born November 19, 1974) is a former Major League Baseball player who played for three seasons.
 He played for the Florida Marlins from 1998 to 1999 and the San Diego Padres in 2000.
 Over his major league career, he played six games as an outfielder, three as a first baseman, and one as a catcher.
 Over his professional career, he played 266 games as a first baseman, 206 as a catcher, and 151 as an outfielder.
 Currently he is employed by the Rio Rancho Police Department in New Mexico as a Police officer.
Luis Iván Cruz (born May 3, 1968 in Fajardo, Puerto Rico) is a retired Major League Baseball first baseman.
 He played during four seasons at the major league level for the New York Yankees, Pittsburgh Pirates, and St. Louis Cardinals.
 He was drafted by the Detroit Tigers in the 28th round of the 1989 amateur draft.
 Cruz played his first professional season with their Class-A (Short Season) Niagara Falls Rapids in , and his last with the Chunichi Dragons of Japan's Central League in .
 He played his last affiliated season with St. Louis and their Triple-A Memphis Redbirds in , in which he won the Joe Bauman Home Run Award.
 In 2008, he entered his first of two seasons as manager of the U.S. Military All-Stars/Heroes of the Diamond and the Latin Stars "Red, White and Blue Tour" posting consecutive winning seasons.
 Under Cruz’s tutelage, over 25 players were offered scholarships or professional contracts.
 In 2010, he made his affiliated debut as the manager of the Peoria Padres, the Rookie Short Season A-ball affiliate of the San Diego Padres.
Napoleon "Chance" Cummings (June 8, 1892 – April 22, 1974) was an American baseball first baseman and second baseman in the Negro leagues.
 He played from 1916 to 1928, mostly with the Atlantic City Bacharach Giants.
 He began his career in Jacksonville, Florida with the Duval Giants and moved with the team to Atlantic City, New Jersey to become one of the original Bacharach Giants from 1916 to 1918.
 He returned to the Bacharach Giants from 1923 to 1928 and was part of the team when they won Eastern Colored League pennants in 1926 and 1927.
 His nickname, "Chance," came from being compared to the Chicago Cubs' first baseman, Frank Chance.
"Who's on First?"
 is a comedy routine made famous by Abbott and Costello.
 The premise of the sketch is that Abbott is identifying the players on a baseball team for Costello, but their names and nicknames can be interpreted as non-responsive answers to Costello's questions.
 For example, the first baseman is named "Who"; thus, the utterance "Who's on first" is ambiguous between the question ("Which person is the first baseman?")
 and the answer ("The name of the first baseman is 'Who).
Anthony Vincent Rizzo (born August 8, 1989) is an American professional baseball first baseman for the Chicago Cubs of Major League Baseball (MLB).
 He is a three-time All-Star.
 Rizzo was selected by the Boston Red Sox in the sixth round of the 2007 MLB draft and became a top minor league prospect in the Red Sox organization.
 He was traded to the San Diego Padres after the 2010 season along with three other prospects in exchange for All-Star first baseman Adrian Gonzalez.
 After being traded to the Cubs in 2012, he developed into an All-Star player.
Frederick Stanley McGriff (born October 31, 1963) is an American former professional baseball first baseman, who played for six Major League Baseball (MLB) teams from 1986 through 2004.
 A power-hitting first baseman, he became a five-time All-Star and led both leagues in home runs in separate years – the American League in 1989 and the National League in 1992.
 McGriff finished his career with 493 home runs, tied with Hall of Fame player Lou Gehrig, and only seven homers away from joining the 500 home run club.
 He won a World Series title as a first baseman with the Atlanta Braves in 1995.
 He currently works in the Atlanta Braves' front office as Special Assistant to Baseball Operations.
Clifford Earl Torgeson (January 1, 1924 – November 8, 1990) was an American Major League Baseball player from Snohomish, Washington.
 A first baseman, he played on five teams for 15 years, from 1947 through 1961.
 He was known by his middle name, Earl, and his nickname was "The Earl of Snohomish", a nickname originally owned by baseball hall of famer, Earl Averill, also from Torgeson's hometown.
 In 1950, Torgeson led the National League (NL) with 120 runs scored and in 1957, he led the American League (AL) with a .999 fielding average as first baseman.
Adrián González Savín (born May 8, 1982), also known by his nicknames A-Gon and Titán, is an American-born Mexican professional baseball first baseman for the Los Angeles Dodgers of Major League Baseball (MLB).

Question: What is the nickname of the first baseman who was traded by the Padres in 2010?
Answer: A-Gon