Federer, Djokovic open with triumphs at Miami
Roger Federer of Switzerland serves against Ivo Karlovic of Croatia during the Sony Open at Crandon Park Tennis Center on March 21, 2014 in Key Biscayne, Florida - by Clive Brunskill
Two-time Miami champion Federer played steady, controlled tennis for a 6-4 7-6 (7/4) defeat of Ivo Karlovic for a third-round spot.
Second seed Djokovic, winner of the Indian Wells trophy over his Swiss rival last weekend in California, eased past Jeremy Chardy, 6-4, 6-3.
France's Chardy delayed the inevitable ahead of the final game, taking a medical timeout after hobbling to a courtside entry tunnel with an ankle problem.
As Djokovic fidgeted with practice serves, Chardy returned to take his medicine, with the three-time champion Serb advancing with three aces in the concluding game.
Fifth seed Federer, now 11-1 all-time against Karlovic, was impeccable in the opening set, losing his only point on serve as he stood 5-4, 40-0 moments before serving out the opener.
A winning tie-break in the second finally made the difference for Federer, now 42-12 in Miami with titles in 2005 and 2006.
"I made sure I had a lot of first serves in, made sure I stayed aggressive from the baseline," said the Swiss. "I think it worked really well, hardly any unforced errors.
"I was able to move Ivo around, and I was able to maintain that throughout the match, which was key. I could focus a bit on returning while then holding serve, which is important against Ivo."
Federer missed the tournament a year ago as he rested with back pain but has turned his 2014 season around after a low-key 2013.
He withstood 13 aces from the big-hitting Croatian in the 74-minute win.
Spanish fourth seed David Ferrer made a winning comeback after missing Indian Wells with injury, defeating Teimuraz Gabashvili 6-4, 6-0
French ninth seed Richard Gasquet reached the third round over Alejandro Gonzalez of Colombia, winning 7-6 (9/7), 6-4.
South African Kevin Anderson, the 17th seed, beat Horacio Zeballos of Argentina 6-4, 6-3 while German Florian Mayer, the 30th seed, defeated Ivan Dodig of Croatia 6-3, 6-2.
China's Li Na reached the third round on the women's side as intended opponent Alisa Kleybanova withdrew with viral illness before their match.
The result sends the second seed into a contest against American Madison Keys who beat Daniela Hantuchova 6-4, 6-2.
Two seeds lost in upsets as American Varvara Lepchenko put out seventh seeded Jelena Jankovic 6-3, 2-6, 7-6 (7/2) and Czech Barbora Zahlavova Strycova beat number 13 Italian Roberta Vinci, 6-4, 2-6, 7-5.
Australian Open runner-up and 10th seed Dominika Cibulkova defeated Yvonne Meusburger 6-1, 6-2.
Elina Svitolina won her third match over Australian Open semi-finalist Eugenie Bouchard, the 18th-seed, 1-6, 6-1, 6-2 after losing to the Canadian in the 2012 junior Wimbledon final.
France's Alize Cornet beat Andrea Petkovic 6-2, 6-7 (0/7), 6-4 as the frustrated German drop-kicked a racquet some considerable distance during a moment of anger.