Activists plan to reprise their controversial “Where is Peng Shuai?” protest at next month’s grand slam, with the support of three-time Australian Open winner Martina Navratilova. At this year’s Open in January, Tennis Australia was criticised for initially confiscating the shirts, citing a ban on “commercial or political” material. The decision was later reversed. Protesters say hundreds of new “Where is Peng Shuai?” shirts have already been printed with plans to hand out 1,000 to tennis fans outside the Australian Open gates. Peng disappeared from public view for several weeks…