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Chuck Burton, Associated Press
New York Giants' Eli Manning (10) scrambles as Carolina Panthers' Ugo Chinasa (63) gives chase in the first quarter of an NFL football preseason game in Charlotte, N.C., Saturday, Aug. 13, 2011.

CHARLOTTE, N.C. — Cam Newton led a pair of field-goal drives in his NFL debut, and Jimmy Clausen threw a touchdown pass to Greg Olsen to help the Carolina Panthers beat the New York Giants 20-10 in a preseason game Saturday night.

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Newton, the Heisman Trophy winner from Auburn and top overall pick in the NFL draft, had mixed results. He struggled with his accuracy and twice failed to get the Panthers into the end zone on promising first-half drives. But he also showed plenty of zip on his throws and brought some big-play potential to the league's worst offense last season.

Newton completed 8 of 19 throws for 134 yards, including a pair of completions of at least 30 yards. He entered the game to loud cheers on Carolina's first drive of the second quarter and left early in the fourth.