Two-time Wimbledon champion Petra Kvitova said she is “fortunate to be alive” after a knife attack at her home in the Czech Republic on Tuesday. The 26-year-old, who won Wimbledon titles in 2011 and 2014 and is currently ranked No. 11 in the world, was at her apartment in the Czech town of Prostejov when she was a victim of a burglary, her publicist Karel Tejkal said.Kvitova was not thought t