|Birth Day:||December 30, 1977|
|Birth Place:||Sydney, Australia|
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He attended William Clarke College in Kellyville, New South Wales.
Balfour made his major league debut with the Minnesota Twins in 2001 and played with them until 2004.
After missing 2005 with an injury, he played in the Cincinnati Reds organization in 2006.
After a three-year absence, Balfour made his return to the major leagues on 18 July, 2007, in the 8th inning with the Milwaukee Brewers. He relieved Chris Capuano in a 2–2 tie with the Arizona Diamondbacks, striking out Chris Young, the first hitter he faced. With two outs in the 8th, he hit a batter and walked another before giving up a three-run home run to Mark Reynolds, giving the Diamondbacks a 5–2 lead. Balfour would finish the 8th and 9th inning and take the loss in relief, having given up three earned runs in the 5–2 defeat.
The Brewers designated Balfour for assignment on 27 July 2007, and traded him to the Tampa Bay Rays that day for Seth McClung. He finished the season in the Rays' bullpen and was re-signed to a one-year deal.
He came into 2008 spring training as a long shot to make the Rays' bullpen. Despite a solid spring training, he eventually lost for on the final spot and was designated for assignment. He cleared waivers and accepted an outright assignment to Durham on 3 April 2008.
He was recalled from Triple-A Durham on 29 May 2008. He earned a save on 31 May against the Chicago White Sox, retiring Brian Anderson to end the game in a Rays 2–0 win. In a series sweep against the Chicago Cubs at Tropicana Field, he was credited with two of the three wins – the first on 16 June, relieving Scott Kazmir with the score 1–1 and bases loaded, pitching 1 ⁄3 perfect innings in a 3–2 win; the second on 18 June, entering the game trailing 1–2, and pitching 1 ⁄3 innings, recording three strikeouts, in a game the Rays won 8–3.
He finished 2008 with a 1.54 ERA, a 6–2 record, 4 saves out of 5 opportunities, 14 holds, and 82 strikeouts over 58 ⁄3 IP in 51 appearances. He helped the Rays win their first divisional title and American League pennant (against the Boston Red Sox), losing to the Phillies in the World Series,
Balfour is known to shout at himself while on the mound and use profanity to fire himself up. On 2 October 2008, during Game 1 of the ALDS, he was involved in an exchange of words with Chicago White Sox shortstop Orlando Cabrera. With the bases loaded and two outs, his first pitch to Cabrera was outside for ball one. Cabrera then kicked the dirt in front of the batter's box in the direction of the pitcher's mound and according to Balfour, Cabrera told him to "throw it over the plate." Unaware of Balfour's behavior while pitching, Cabrera was under the impression that he was the one being yelled at. The at-bat continued and ended with Cabrera striking out. Balfour stormed off the mound, yelling at Cabrera as he walked to the dugout. Balfour stated after the game that he told Cabrera to "go sit down" and that he "might have mixed one or two words in with it." Deemed a misunderstanding between the two, there were no further incidents in the series, with Balfour getting the final out as the Rays won three games to one.
In 2009, he chose to skip the 2009 World Baseball Classic because the Rays asked him not to play for Australia while he was still under contract. That season was much less successful for the Rays, who finished 84–78, 19 games behind the New York Yankees. Although he pitched considerably more innings and games pitched, he finished a disappointing 5–4, with 4 saves and a 4.81 ERA for the season with 69 strikeouts compared to the previous season's 82.
In December 2009, he signed a new contract with Tampa Bay, worth $2.05 million over one year.
Balfour's father, David, was a rugby player and general manager and owner of the Sydney Blue Sox. David was diagnosed with pancreatic cancer in 2010 and died on 10 March 2015.
On 18 January 2011, Balfour signed a 2-year, $8 million contract with the Oakland Athletics. On 20 March 2012, he was named the Athletics' closer over Brian Fuentes. Balfour held the closer role for the early part of the 2012 season but was demoted after a few blown saves to the role of setup man. In early August, Balfour regained the closer role from Ryan Cook. Balfour went 3–2 in 75 appearances with 24 saves in 74 ⁄3 innings pitched in 2012. On 29 October, the Athletics decided to exercise their option for Balfour worth $4.5M.
On 8 July 2013, Balfour set the record for most consecutive saves for the Athletics, earning his 41st in a 2–1 win over the Pittsburgh Pirates. He was selected later in the month as a replacement All-Star pitcher for teammate Bartolo Colón.
On 17 December 2013, Balfour came to an agreement with the Baltimore Orioles on a two-year $15 million deal. However, on 19 December 2013, it was revealed that the deal was in serious jeopardy as a result of issues that came up during his physical. On 20 December, the Orioles announced that they would not be signing him and that they would look elsewhere for relief help. Balfour responded that he was perfectly healthy and other doctors who examined him disputed the Orioles interpretation of his physical results. He said he would consider filing a grievance with the players association.
Balfour subsequently agreed to a two-year contract with the Rays, worth $12 million. After starting the 2014 season with a 6.46 ERA in 24 games, Balfour was removed from the closer role on 9 June 2014.
He was designated for assignment by the Rays on 18 April 2015, and released on 29 April. Several days after the team released him, Balfour signed a minor league deal back with the Rays. While pitching with Triple-A Durham, Balfour held a 2.79 ERA in eight games, owning an 11:4 K:BB ratio over 9 2/3 innings. He opted out of his contract on 28 May.
Balfour was inducted into the Baseball Australia Hall of Fame in February 2015.
On 29 April 2016, Balfour announced his retirement.
Currently, Grant Balfour is 43 years, 8 months and 19 days old. Grant Balfour will celebrate 44th birthday on a Thursday 30th of December 2021.
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