Grant Robert Balfour (born 30 December 1977, in Sydney, New South Wales, Australia) is a relief pitcher who plays for the Oakland Athletics. He has previously played for the Tampa Bay Rays, Minnesota Twins and Milwaukee Brewers.
Balfour spent his first years at school attending Kings Langley Public School and high school years at 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, in 2006 he played in the Cincinnati Reds organization. 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.