Stefanos Tsitsipas stormed into his third Australian Open semifinal against either Daniil Medvedev or Felix Auger-Aliassime MELBOURNE: Stefanos Tsitsipas stormed into his third Australian Open semifinal with a blistering straight-sets victory over Jannik Sinner on Wednesday. The Greek fourth seed played his best tennis yet in the year’s opening major to romp past the 11th-seeded Italian 6-3, 6-4, 6-2 in 2hr 6min and into a semifinal against either Daniil Medvedev or Felix Auger-Aliassime.