A black ribbon is pinned on the cap of Vera Zvonareva of Russia as she plays a shot to Petra Kvitova of the Czech Republic during their quarter-final match at the Australian Open tennis tournament.Zvonareva wore the black ribbon to commemorate the victims of the Moscow airport bombing. – Photo by Reuters

Petra Kvitova of the Czech Republic plays a stroke during her women's singles quarter-final match against Vera Zvonareva of Russia. Zvonareva won 6-2 and 6-4. – Photo by AFP

Andy Murray of Britain plays a shot to Alexandr Dolgopolov of Ukraine. – Photo by Reuters

Alexandr Dolgopolov of Ukraine reacts after a point against Andy Murray of Britain. Murray won 7-5, 6-3, 6-7 and 6-3. – Photo by AFP

Agnieszka Radwanska of Poland plays a shot to Kim Clijsters of Belgium. – Photo by Reuters

Kim Clijsters of Belgium returns against Agnieszka Radwanska of Poland. Clijsters won 6-3 and 7-6. – Photo by AFP

Kim Clijsters of Belgium holds Matilda, a baby echidna from Healesville Sanctuary, in the players lounge. – Photo by Reuters

Rafael Nadal of Spain plays a shot to compatriot David Ferrer. – Photo by Reuters

David Ferrer of Spain plays a shot to compatriot Rafael Nadal during their quarter-final match. – Photo by Reuters

Rafael Nadal of Spain sits talking to a trainer with his left leg bandaged between games against David Ferrer of Spain. – Photo by AFP