John Bohn/Globe Staff

Roger Clemens and Toronto catcher Charlie O'Brien stood for the singing of the Canadian national anthem before his first game back at Fenway Park.

John Tlumacki/Globe Staff

Clemens delivered the first pitch to Red Sox leadoff hitter Nomar Garciaparra.

John Bohn/Globe Staff

Clemens, who is tied for the most wins in Red Sox history with Cy Young, had never pitched as a visitor at Fenway before.

John Tlumacki/Globe Staff

Clemens struck out old teammate Mo Vaughn three times during the game.

Michael Robinson-Chavez/Globe Staff

Clemens had 16 strikeouts over eight innings to earn his 14th win.