Carson Benge and Francisco Alvarez go deep to extend the Mets' lead in the sixth inning. (0:45) NEW YORK -- In his fourth major league plate appearance, Carson Benge connected. And when he saw the ball sail over the right-field fence, the 23-year-old New York Mets rookie couldn't help but shout and jump for joy as he rounded first base. "I kind of blacked out running around the bases. I don't really remember too much," Benge said. "I know I got it good off the bat." Benge homered in his major league debut for his first career hit and was one of several Mets newcomers who played pivotal roles as New York pounded the Pittsburgh Pirates 11-7 on Opening Day. After winning the right-field job at the end of spring training, Benge also walked twice and stole a base Thursday. He said he had 22 family members and friends in the sellout crowd of 41,449 at Citi Field, including his parents and girlfriend. "Definitely anxious to get out there, ready to start playing," Benge said, describing his emotions before the game.…