Veteran India tennis star Rohan Bopanna entered the history books on Wednesday after he and his Australia partner Matthew Ebden reached the semi-finals of the men's doubles event at the Australia Open. The 43-year-old became the oldest World No. 1 in the Association of Tennis Professionals (ATP) rankings. Bopanna and Ebden outclassed Argentina's Maximo Gonzalez and Andres Molteni in straight sets at the Margaret Court Arena. The Indo-Australian pair clinched a 6-4, 7-6 (5) victory to secure a safe passage into the semi-finals of the tournament.