After setting up Oscar's opener, Lampard, who began the game as a substitute, converted a 45th-minute penalty to move within one of the club record held by the watching Bobby Tambling.
"Frank is a great player," Benitez said. "I'm really pleased he's scored another goal and hopefully he can score five between now and the end of the season and he'll be much happier and we will be the same."
His appearance midway through the first half in place of dead-leg victim Ramires injected impetus into Chelsea's play.
The goal was his 15th of the season and first following seven scoreless appearances, since moving to 200 goals against his former club West Ham on March 17.
Benitez added: "He's a good player with quality. When you're controlling and have more possession, he can have an influence."
Lampard had dropped to the bench as Benitez manages his options with Chelsea chasing two targets and Thursday's Europa League semi-final second leg with Basle in mind.
Benitez added: "He's a great professional. He's always really focused.
"He would like to play more games, but he understands the main thing is the team and to qualify for the Champions League.
"He wants to play, but he understands the team is first."
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