American tennis star Jessica Pegula says Iga Swiatek becoming a dominant force on hard reminds her of when Rafael Nadal figured out how to play well on grass. Both Nadal and Swiatek became Grand Slam champions as teenagers. In 2005, an 18-year-old Nadal won his first Grand Slam title at the French Open. 15 years later, a 19-year-old Swiatek became a Grand Slam champion – also on the clay courts of Roland Garros. After establishing herself as a premiere clay court player, Swiatek put in the hard work in the offseason and impressively improved her game o …