(AP) -- Mark Buehrle is chasing not only the best start to a season in his 15-year career, but also the best in the history of the Toronto Blue Jays.

The veteran left-hander looks to become the first in the majors with five victories when the Blue Jays open this three-game series with the Boston Red Sox on Friday night.

Buehrle (4-0, 0.64 ERA) has won his first four starts to match a personal best from 2002, when he finished with a career-high 19 victories for the Chicago White Sox. He also joined Jimmy Key (1991), Pat Hentgen ('93) and Gustavo Chacin (2006) as the only Toronto pitchers to begin a season with four straight wins.