Rodriguez hit his 549th home run in a September 3, 2008, game against the Tampa Bay Rays. The opposing manager objected that the ball was foul, and for the first time in MLB history, instant replay (a process officially introduced a few days earlier) was used to review the play and uphold the umpires' ruling. He was one of only four batters in the AL to have at least 18 home runs and 18 stolen bases in both 2007 and 2008, along with Torii Hunter, Ian Kinsler, and Grady Sizemore. Rodriguez hit a home run every 14.6 at-bats in 2008, the second best ratio on the team behind Jason Giambi. Rodriguez played 138 games during the 2008 season with a .302 average, 35 home runs, 103 RBI, and an AL best .573 slugging percentage.