Vaidisova through to quarter-finals in Miami

Czech tennis star Nicole Vaidisova has reached the quarter-finals of the Miami Open. She beat Vera Dushineva of Russia 6-2 6-4. In men's tennis, Radek Stepanek beat Columbia's Alejandro Falla to reach the third round. But Tomas Berdych is out in Miami - he lost to Juan Ignacio Chela of Argentina.