Iga Swiatek is the undeniable favorite for a second French Open title after winning her past five tournaments but says she won’t be “heartbroken” if her 28-match unbeaten run comes to an end at Roland Garros. Since the shock retirement of world number one Ashleigh Barty, the 20-year-old Swiatek has swept aside all-comers and transformed herself into the player to beat in women’s tennis. The Pole hasn’t lost since falling to another former Roland Garros champion, Jelena Ostapenko, in Dubai in February. Her winning streak is the longest on the WTA tour since Serena Williams won 34 matches in a r…