Canada's Milos Raonic won his opening match at the Madrid Open on Tuesday, defeating Jeremy Chardy of France 6-3, 6-3 in just over an hour.
Raonic, the No. 8 seed from Thornhill, Ont., fired 11 aces and did not have a double-fault as he comfortably advanced to the third round at the Masters Series event.
Also Tuesday, Roger Federer pulled out of the tournament to spend more time with his family as his wife awaits the birth of another child.
The fourth-seeded Swiss player is the second big name to withdraw after Novak Djokovic pulled out because of a wrist injury. Poland's Lukasc Kubot takes Federer's place to face Gilles Simon of France.
David Ferrer struggled through Madrid's high altitude and a bout of nerves to pull out a 7-6 (6), 5-7, 6-3 victory over Spanish countryman Albert Ramos.
Ferrer saved four set points as he won five straight points to take the first set tiebreak, clinching the lead with a crosscourt forehand smash.
After being broken to trail 6-5 in the second set, Ferrer reeled off four straight errors for his 115th-ranked opponent to even it before eventually pulling through in just under three hours.
But it wasn't without repeated scenes of frustration when he mumbled to himself and his entourage nearby.
"You say things when you're nervous in the match that you don't have a feel for. You can write a book about a match," said Ferrer about his motivation, before referring to thinner air and its effect on the ball. "The first day is not easy. You miss more, but that's all."
Fabio Fognini's recent struggles on Spanish clay continued as the 13th-seeded Italian lost 7-5, 4-6, 6-3 to Ukraine's Alexandr Dolgopolov. Fognini failed to get out of the second round at Barcelona last month.
Nicolas Almagro will play Andy Murray next after finally dispensing with Andrey Golubev of Kazakhstan, 6-3, 6-7 (9), 7-6 (4) with his 11th match point.
Other second-round winners included Ernests Gulbis of Latvia, South Africa's Kevin Anderson, Igor Sijsling of the Netherlands, and Juan Monaco of Argentina — who goes on to play defending champion Rafael Nadal on Wednesday.
In women's play, Maria Sharapova avoided an early exit by rallying to beat Christina McHale to reach the third round. Trailing 4-1 in the final set, Sharapova steadied her erratic service game and took command again to beat the 56th-ranked American 6-1, 4-6, 6-4 on clay at the Magic Box tennis centre.
The ninth-ranked Russian looked to be cruising before McHale broke late in the second set to tie the match and then took her commanding lead in the final set after breaking Sharapova.
However, Sharapova didn't surrender a point after that as McHale netted to be broken to see her advantage dip to 4-3, and Sharapova eventually fired an ace down the middle to eliminate McHale for the second year running.
"After a really good start [in Madrid] I didn't keep that level. I think I had a bit of a letdown," said 2013 finalist Sharapova, who is coming off a tournament victory in Stuttgart.
Earlier, Li Na continued her recent dominance of Zheng Jie by easing into the third round 6-2, 6-3 for her fourth straight victory against her fellow Chinese player. Zheng hasn't won a set from the second-ranked Li since her last victory in 2006.
Lucie Safarova of the Czech Republic also advanced with a 6-1, 6-2 win over Magdalena Rybarikova of Slovakia, while American Sloane Stephens was also a winner.