World No 1 Novak Djokovic and the man who can dislodge him from the top spot by next week, Rafael Nadal, kicked off their China Open campaign with straight set victories on Tuesday.
Japanese fifth seed Kei Nishikori pulled out of Wimbledon before his second round match on Wednesday after failing to recover from a calf strain.
Andy Murray was overwhelmed 6-3, 6-2 by Santiago Giraldo and champion Rafael Nadal showed signs of rustiness before reaching the Madrid Open quarter-finals with a 6-1, 6-4 win over Jarkko Nieminen on Thursday.
Rafa Nadal had to dig deep after coming under heavy fire from Colombia's Santiago Giraldo in a brutal 7-6, 6-3 quarter-final victory at the Japan Open on Friday.
Top seed Rafa Nadal ran hard-serving Canadian Milos Raonic ragged in a 7-5, 6-3 victory to secure a place in the quarter-finals of the Japan Open on Thursday.
Top seed David Ferrer will meet former world number three David Nalbandian in the final of the Auckland Open after they both advanced with easy semi-final victories on Friday.
Roger Federer showed that time was still on his side as the Swiss master rang the closing bell on Monday's opening day at the US Open tennis championship with a quick victory at Arthur Ashe Stadium.
Fit-again Andy Roddick kept his US Open preparations on a smooth track by crushing Colombian Santiago Giraldo 6-1, 6-3 in the third round of the Winston-Salem Open on Wednesday.
Defending champion and second seed Marin Cilic led a procession of seeds into the semi-finals of the Chennai Open on Friday, a day marred by incessant rain and the subsequent delay in matches. Cilic beat Colombian Santiago Giraldo 7-6 (3), 6-1 in the day's final singles quarter-final to set up a last four meeting with the in-form fourth seed Janko Tipsarevic, the Serbian managing to eventually brush aside the challenge of Dutch rookie, Thiemo De Bakker, 7-5, 7-5.
Rafael Nadal swept aside Colombian qualifier Santiago Giraldo 6-3, 6-3 in the second round in Indian Wells.
Yuki Bhambri and his New Zealand partner Michael Venus registered a straight sets victory on their Grand Slam debut, but Divij Sharan's Australian Open campaign ended in the first round, in Melbourne, on Wednesday.
Roger Federer was given a fright before reaching the semi-final of the inaugural Istanbul Open.
India's Somdev Devvarman was beaten in straight sets by World No. 11 Andy Murray in the second round of the ATP Shenzen Open, in Shenzhen, on Thursday.
Steady rain hit the US Open on Monday, washing out the last match on Arthur Ashe Stadium court featuring five-time champion Roger Federer.
Roger Federer thinks a tie-breaker at 12-12 would be the best compromise following calls for Wimbledon to step into line with the US Open and scrap long deciding sets.
Rafa Nadal's bid to get back to top form before the French Open suffered a setback when he crashed to a 6-4, 7-6(6) defeat to 13th-seeded Italian Fabio Fognini in the third round of the Barcelona Open on Thursday.
Images from Day one of the 2019 Davis Cup at La Caja Magica in Madrid on Monday
Marin Cilic completed a dream week by steering Croatia into the Davis Cup World Group on Sunday but Spain found themselves out in the wilderness after crashing to defeat in Brazil.
A struggling and edgy Rafael Nadal crashed out of the Miami Open.
Two time Miami Open winner Victoria Azarenka crushed Serbia's Jelena Jankovic.
Gunning for yet another Grand Slam title, India's old war horse Leander Paes and his Czech partner Radek Stepanek have been seeded fifth at the Australian Open and they will open their campaign against Czech pair of Lukas Dlouhy and Lukas Rosol.
Defending champion Novak Djokovic moved confidently into the second round of Wimbledon with a 6-4, 6-4, 6-4 win over German Philipp Kohlschreiber on Monday.
Soccer's governing body FIFA has agreed to ban the third-party ownership (TPO) of players, its president Sepp Blatter said on Friday, seven years after first promising to outlaw the practice.