Born in Santa Cruz, California, Arellanes attended Santa Clara University before joining the Boston Red Sox during the 1908 midseason. He posted a 4–3 record and a 1.82 ERA in eight starts, including a one-hit victory against the Philadelphia Athletics. His most productive season came in 1909, when he recorded 16 wins with a 2.18 ERA as the replacement of Cy Young in the pitching rotation, leading the American League in games finished (15) and saves (eight). His 1910 season was interrupted by illness and he finished at 4–7, 2.88 in 18 games. He ended the year with the Sacramento Solons of the Pacific Coast League, where he pitched a nine-inning no-hitter, losing a 2–0 game.\n', '

In a three-season major league career, Arellanes posted a 24–22 record with 148 strikeouts and a 2.28 ERA in 409⅔ innings of work. A strong control pitcher, he allowed 85 walks for a 1.86 BB/9IP.\n', '

Arellanes is sometimes cited as the first Mexican-American to play baseball in the major leagues. However, Sandy Nava was the first known Mexican-American to play in the majors, when he joined the 1882 Providence Grays of the National League.\n', '

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