Results on day four of the Australian Open Grand Slam at Melbourne Park on Thursday (x denotes seeding): Men's singles 2nd rd Ernests Gulbis (LAT) bt Aljaz Bedene (SLO) 7-5, 6-3, 6-2 Dominic Thiem (AUT x5) bt Alex Bolt (AUS) 6-2, 5-7, 6-7 (5/7), 6-1, 6-2 Daniil Medvedev (RUS x4) bt Pedro Martinez (ESP) 7-5, 6-1, 6-3 Alexei Popyrin (AUS) bt Jaume Munar (ESP) 6-2, 7-6 (7/5), 6-2 Alexander Zverev (GER x7) bt Egor Gerasimov (BLR) 7-6 (7/5), 6-4, 7-5 Women's singles 2nd rd Belinda Bencic (SUI x6) bt Jelena Ostapenko (LAT) 7-5, 7-5 Donna Vekic (CRO x19) bt Alize Cornet (FRA) 6-4, 6-2 Elise Mertens (BEL x16) bt Heather Watson (GBR) 6-3, 6-0 Catherine Bellis (USA) bt Karolina Muchova (CZE x20) 6-4, 6-4 Garbine Muguruza (ESP) bt Ajla Tomljanovic (AUS) 6-3, 3-6, 6-3 Zarina Diyas (KAZ) bt Anna Blinkova (RUS) 4-6, 6-3, 6-4 Kiki Bertens (NED x9) bt Arina Rodionova (AUS) 6-3, 7-5 Angelique Kerber (GER x17) bt Priscilla Hon (AUS) 6-3, 6-2 Karolina Pliskova (CZE x2) bt Laura Siegemund (GER) 6-3, 6-3 afp