No. 2 seed Daniil Medvedev of Russia and No. 4 Stefanos Tsitsipas of Greece won their quarterfinal matches in very different fashions Wednesday at the Australian Open in Melbourne. They will meet in the semifinals of the season's first Grand Slam event. No. 6 seed Rafael Nadal of Spain and No. 7 Matteo Berrettini will battle in the other pairing. Medvedev dropped behind by two sets, rallied and survived a match point in