Andrey Golubev defeated German wild card Philipp Petzschner 6-4, 6-1 to set up a second-round clash with defending champion Fabio Fognini at the Mercedes Cup on Monday.
Ivo Karlovic of Croatia advanced to the Duesseldorf Open semifinals on Thursday, hitting 19 aces in a 6-4, 3-6, 6-3 win over defending champion Juan Monaco of Argentina.
Top-seeded Philipp Kohlschreiber cruised into the quarterfinals of the Duesseldorf Open by beating Teymuraz Gabashvili 6-3, 6-1 on Wednesday.
Defending champion Juan Monaco eased past Benjamin Becker 6-2, 6-1 to reach the second round of the ATP Duesseldorf Open on Tuesday.
Ninth-seeded John Isner was upset by 64th-ranked Jurgen Melzer 7-6 (7), 6-3 in the first round of the Italian Open on Sunday, eliminating the lone American from the men's event.
Top-ranked Serena Williams breezed into the Madrid Open third round with a 6-2, 6-3 victory over Shuai Peng on Wednesday.
Santiago Giraldo upset second-seeded Tommy Robredo 6-3, 6-4 on Thursday to advance to the quarterfinals of the U.S. Men's Clay Court Championship.
John Isner apologized for his performance. Dustin Brown said it felt unbelievable.
Top-seeded Tommy Haas came back to defeat Horacio Zeballos of Argentina 6-3, 5-7, 6-2 to advance to the Brazil Open semifinals on Friday.
Wild card Thomaz Bellucci continued to feed off his home crowd Thursday, beating Austria's Andreas Haider-Maurer 7-6 (4), 5-7, 6-3 to reach the quarterfinals of the Brazil Open.
Home-crowd favorite Thomaz Bellucci defeated eighth-seeded Santiago Giraldo of Colombia 4-6, 7-5, 6-3 to reach the second round of the Brazil Open on Tuesday.
Second-seeded David Ferrer overcame a tough first set to advance to the Rio Open quarterfinals with a 7-6 (2), 6-1 win over Argentina's Federico Delbonis on Wednesday.
Rafael Nadal showed no signs of a tender back Tuesday, defeating fellow Spaniard Daniel Gimeno-Traver 6-3, 7-5 in the first round of the Rio Open.
Bulgarian qualifier Tsvetana Pironkova beat fifth-seeded Angelique Kerber of Germany 6-4, 6-4 on Friday to win her first WTA title at the Sydney International.
Juan Martin del Potro, Jo-Wilfried Tsonga and Roger Federer find themselves at crossroads as the 2014 season kicks off.
The name of the game is the serve. It comes as no surprise that the best players in the game execute this shot better than anyone else.