Radwanska out of US Open

New York - Polish second seed Agnieszka Radwanska was knocked out of the US Open in the fourth round on Monday losing 6-1, 6-4 to Italy's Roberta Vinci, the 20th seed.

Vinci will play fellow Italian and doubles partner Sara Errani, the 10th seed, for a place in the semi-finals.

Results from the eighth day of the US Open on Monday (x denotes seeding):

Men

4th rd

Roger Federer (SUI x1) bt Mardy Fish (USA x23) - walkover

Tomas Berdych (CZE x6) bt Nicolas Almagro (ESP x11) 7-6 (7/4), 6-4, 6-1

Marin Cilic (CRO x12) bt Martin Klizan (SVK) 7-5, 6-4, 6-0

Andy Murray (GBR x3) bt Milos Raonic (CAN x15) 6-4, 6-4, 6-2

Women

4th rd

Ana Ivanovic (SRB x12) bt Tsvetana Pironkova (BUL) 6-0, 6-4

Serena Williams (USA x4) bt Andrea Hlavacova (CZE) 6-0, 6-0

Sara Errani (ITA x10) bt Angelique Kerber (GER x6) 7-6 (7/5), 6-3

Roberta Vinci (ITA x20) bt Agnieszka Radwanska (POL x2) 6-1, 6-4

Mixed Doubles

Quarter-finals

Lisa Huber/Max Mirnyi (USA/BLR x1) bt Nuria Llagostera Vives/David Marrero (ESP) 6-1, 7-5

Kveta Peschke/Marcin Matkowski (CZE/POL x4) bt Sania Mirza/Colin Fleming (IND/GBR) 6-3, 7-5

Ekaterina Makarova/Bruno Soares (RUS/BRA) bt Anastasia Rodionova/Jean-Julien Rojer (AUS/NED) 4-6, 6-3, 10-7

Lucie Hradecka/Frantisek Cermak (CZE x7) bt Elena Vesnina/Leander Paes (RUS/IND x3) 7-6 (7/2), 7-5