Frank Thomas hit his 500th home run Thursday, joining one of baseball's most elite clubs. The Toronto slugger became the 21st major leaguer to reach the career mark, a milestone that has always meant an eventual spot in the Hall of Fame. Thomas hit a three-run shot in the first inning, connecting against Minnesota's Carlos Silva and sending a 1-2 pitch an estimated 396 feet into the left-field stands. The Metrodome crowd responded with a standing ovation for the two-time AL MVP.