Two-time Wimbledon champion Petra Kvitova beat Donna Vekic of Croatia 6-2 7-6(6) on Sunday to lift the German Open title and confirm her form on grass just over a week before the Grand Slam in London. The 33-year-old Czech, who also beat Vekic en route to victory at the Miami Open this year, earned her 31st career title. The left-hander looked completely at ease on the surface as she captured her sixth title on grass, more than any other active WTA player, in