Top-ranked Victoria Azarenka had to exert every ounce of her energy to beat German wild card Mona Barthel 6-4, 6-7 (3-7), 7-5 in a match that lasted for nearly three hours at the Porsche Grand Prix in Stuttgart, Germany on Friday.
Milos Raonic demonstrated his claycourt credentials with a 6-4 7-6 win over Andy Murray in the last eight of the Barcelona Open on Friday before top seed Rafa Nadal crushed Janko Tipsarevic 6-2 6-2 to claim his semi-final place.
World number one Victoria Azarenka moved into the Stuttgart indoor tournament quarter-finals on Thursday as sixth seed Caroline Wozniacki was upset by Angelique Kerber.
Rafa Nadal was less than his dominant best on the clay at the Barcelona Open on Thursday but was still good enough to secure a 6-2 6-3 win over Colombian wildcard Robert Farah and set up a quarter-final clash against Janko Tipsarevic.
Rafa Nadal swept into the third round of the Barcelona Open when he thrashed Guillermo Garcia-Lopez 6-1 6-2.
World number two Maria Sharapova eased into the quarter-finals of the Stuttgart indoor tournament.
World number eight Li Na got a quick early break to clinch a 7-6 6-4 victory against Lucie Safarova.
Andy Murray comfortably beat Sergiy Stakhovsky 6-3 6-2 in his first match at the Barcelona Open.
After the Monte Carlo Masters ended with the predictable Rafa Nadal triumph, the world's top tennis players are set to face something entirely different when they head to Madrid.
Rafa Nadal has played down the significance of his victory over Novak Djokovic in Monte Carlo.
Argentina earned promotion back to the Fed Cup World Cup II following a 6-4, 6-2 victory for Paula Ormaechea against Wang Qiang on Sunday at Parque Roca in the third rubber.
Jelena Jankovic steered Serbia into their first Fed Cup final.