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In 1909, Speaker emerged as the regular starting center fielder for the Red Sox. Exhibiting immediate success, he posted a .309 batting average, not only hitting seven home runs but also contributing 77 RBIs and 35 stolen bases.
Over the next few years, Speaker continued to impress on the field, accumulating a combined WAR (Wins Above Replacement) of 13.9 in 1910 and 1911, boasting a .337 batting average, 15 home runs, and leading the league with doubles and total bases. His standout season was undoubtedly 1912 when he led the league in several categories, including an astounding 53 doubles, helping the Red Sox win the American League pennant that year.