Kvitova moves on; Kerber ousted in New Haven

Third-seeded and defending champion Petra Kvitova fought back for an opening-round victory, while second-seeded Angelique Kerber went by way of a second-round upset Tuesday at the New Haven Open, a final U.S. Open tune-up.Former runner-up Elena Vesnina of Russia upended the left-handed German Kerber in 6-2, 6-4 fashion on the hardcourts at the Connecticut Tennis Center at Yale University