Carla Suarez Navarro surprises Agnieszka Radwanska at Miami Masters

Seventh-seed Agnieszka Radwanska has been knocked out of the Miami Masters in the fourth round by Spain's Carla Suarez Navarro.

Suarez Navarro was the first to break, taking a 3-2 lead, but she lost five of the next seven games as Radwanska grabbed the opener 7-5 in just under an hour.

The Pole's form completely dipped in the second as Suarez Navarro stormed to a 6-0 success to force a decider.

The 12th seed continued her dominance in the third as she opened up a double-break lead at 4-1, but Radwanska fought back to make it 5-4, forcing Suarez Navarro to serve it out.

The Spaniard managed to do so and will face veteran American Venus Williams in the last 16.