Martina Navratilova quits as coach of world No 9 Agnieszka Radwanska after just four months

Martina Navratilova's brief stint as coach of 2012 Wimbledon runner-up Agnieszka Radwanska is finished. Navratilova, who won 18 Grand Slam singles titles as a player, and Poland's Radwanska, who is currently ranked No 9, issued statements on Friday to announce the parting. They announced in December that they would work together.

Maria Sharapova suffers first-ever defeat at Porsche Grand Prix as Russian top seed is beaten by Angelique Kerber

Rafael Nadal dumped out of Barcelona Open as he loses to Italian Fabio Fognini in third round

Agnieszka Radwanska beaten by Sara Errani as another top seed bows out of Porsche Grand Prix in Stuttgart

Rafael Nadal beats Nicolas Almagro in straight sets to reach Barcelona Open third round as Neymar watches on

Marin Cilic continues to struggle for form as he is knocked out in the second round of the Barcelona Open by Victor Estrella 

Ana Ivanovic falls to Caroline Garcia again as fifth seed bows out in first round of Porsche Tennis Grand Prix in Stuttgart

British tennis fans face Wimbledon-style scramble for Davis Cup quarter-final tickets 

Kei Nishikori launches Barcelona Open title defence with win over Teymuraz Gabashvili

Andy Murray watches Lionel Messi and Co defeat PSG in Champions League quarter-final as he takes a break from training

Chelsea manager Jose Mourinho: 'I felt British when Andy Murray won Wimbledon. It was so emotional'

Andy Murray and Davis Cup team to play quarter final against France at Queen's Club

Ana Ivanovic, Maria Sharapova and Caroline Wozniacki head tennis stars attending Porsche Grand Prix opening bash

Serena Williams 'not ready for claycourt season' as tennis star fails to impress during Fed Cup win over Sara Errani

Eugenie Bouchard has gone from being Wimbledon's darling to under pressure star after handshake controversy and dip in form

Rafa Nadal not worried by Novak Djokovic defeat as the king of clay says he can retain his French Open title for sixth year in a...

Novak Djokovic defeats Tomas Berdych to claim Monte Carlo Open and become first player to win opening three Masters events

Serena Williams survives scare against Italian Sara Errani in testing weather conditions in the Fed Cup play-off

Czech Republic on track to retain their Fed Cup title after reaching the final following Petra Kvitova's win over Caroline Garcia

Russia on verge of Fed Cup final after taking 2-0 lead against Germany

Novak Djokovic sees off Rafael Nadal in straight sets of Monte Carlo semi-final 

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