Andy Murray faces the giant American, John Isner, in the fourth round. Photograph: Empics Sport

Sunday's order of play on the showcourts on day seven of the Australian Open. Play starts at midnight GMT:

Rod Laver Arena

(5) Andy Murray (Gbr) v (33) John Isner (USA)

Ivo Karlovic (Cro) v (2) Rafael Nadal (Spa)

Justine Henin (Bel) v Yanina Wickmayer (Bel)

(7) Andy Roddick (USA) v (11) Fernando González (Chi)

Hisense Arena

(31) Alona Bondarenko (Ukr) v Jie Zheng (Chn)

(19) Nadia Petrova (Rus) v (3) Svetlana Kuznetsova (Rus)

(14) Marin Cilic (Cro) v (4) Juan Martín del Potro (Arg)

Maria Kirilenko (Rus) v (2) Dinara Safina (Rus)

Margaret Court Arena

Philipp Marx (Ger) & Igor Zelenay (Svk) v (2) Daniel Nestor (Can) & Nenad Zimonjic (Ser)

Andrea Hlavackova (Cze) & Lucie Hradecka (Cze) v (2) Venus Williams (USA) & Serena Williams (USA)

Sally Peers (Aus) & Laura Robson (Gbr) v Vera Dushevina (Rus) & Anastasia Rodionova (Rus)

Andrea Hlavackova (Cze) & Lukasz Kubot (Pol) v Carly Gullickson (USA) & Bernard Tomic (Aus)

Anna-Lena Groenefeld (Ger) & Christopher Kas (Ger) v Sally Peers (Aus) & Peter Luczak (Aus)