Lester dominates Yankees in Boston's 5-1 win
The Yankees lost their second straight after a three-game winning streak and fell 2 1/2 games behind Tampa Bay for the AL's second wild-card spot. The Rays play at Minnesota on Saturday night.
Boston entered the day with an 8 1/2-game lead over second-place Tampa Bay.
The Red Sox (91-59) improved to a season-high 32 games over .500, their best mark since the final day of their World Series championship season in 2004.