In 2003, Blalock had a breakthrough hitting 29 home runs and 90 RBIs with a .300 batting average. A combination of being able to hit for power and for average drew early comparisons to George Brett and helped him to get voted to the All-Star Game in his first full season as a Ranger, where he hit the game winning home run off Los Angeles Dodgers closer Eric Gagné. Blalock finished the 2004 season with 32 home runs and over 100 RBIs, and was voted to his second All-Star Game, when he participated in the Home Run Derby.