Associated Press Roger Federer made a victorious return Friday to the Sony Open in Key Biscayne, Fla., after skipping last year’s tournament, and then was treated to a tribute on the stadium video screen. “It looks like a farewell video,” Federer told the crowd with a giggle. “I miss one year, and you make me feel guilty.” Federer is back, as he showed by beating big-serving Ivo Karlovic 6-4, 7-6 (4). Federer lost just three points on his serve to his 6-foot-11 opponent, and in a match with few rallies, he committed only three unforced errors. Three-time champion Novak Djokovic followed Federer onto the stadium court and into the third round, beating Jeremy Chardy 6-4, 6-3. At 32, Federer has looked rejuvenated recently, and was the runner-up to Djokovic last week at Indian Wells. The 17-time Grand Slam champion says his new racket gives him more power, and he is moving as he did in the old days. After falling out of the top five last year for the first time since 2002, Federer returned to No. 5 this week. Federer led from the start against Karlovic, making the surprising choice to receive after winning the toss and earning the lone break of the match in the opening game. “I just felt like, you know, let him go first and see how it goes,” Federer said. “It worked well today because I got the early break right away. That relaxed me for the rest of the first set clearly, but still he hung around.” Djokovic converted all three of his break-point chances against Chardy, who was hobbled at the end after hurting his right ankle in the next-to-last game. “When I was supposed to play my best and come up with some good serves and good shots, that’s what I did in both sets,” Djokovic said. On the women’s side, No. 2-seeded Li Na reached the third round when Alisa Kleybanova withdrew because of a viral illness. Kleybanova, who won in doubles on Thursday, is a former top 20-player mounting a career comeback from Hodgkin’s lymphoma. No. 3 Agnieszka Radwanska, the tournament champion in 2012, defeated Romina Oprandi 6-0, 6-4. No. 6 Simona Halep withdrew because of a right toe injury. American Varvara Lepchenko outlasted No. 7 Jelena Jankovic 6-3, 2-6, 7-6 (2).