Top-ranked Iga Swiatek seems to be finding her groove on grass ahead of Wimbledon. Three times a French Open winner on clay and once a U.S. Open winner on the New York hard courts, Swiatek played her first tour-level, grass-court quarterfinal on Thursday against Anna Blinkova at the Bad Homburg Open. Poland's Iga Swiatek celebrates after beating Russia's Anna Blinkova …