RIO DE JANEIRO -- White tape peeking out from under the red sweat band on his injured left wrist, Rafael Nadal was back in action Sunday, playing his first match in 2 1/2 months.And he was back at an Olympics for the first time in eight years.He was not, Nadal insisted after a 6-2, 6-1 victory over Argentinas Federico Delbonis at the Rio de Janeiro Games, back at full strength, however. And he will not, he also insisted, discuss the problematic tendon sheath in his racket-wielding arm for the rest of the event.My wrist is not perfect. My wrist needs more time, the Spaniard said. If it was a `normal tournament on the circuit, I wouldnt be here. My wrist is not perfect. It isnt 100 percent.Nadal won a gold medal in singles at the 2008 Beijing Games, but he missed the 2012 London Olympics because of a knee injury that also forced him out of the U.S. Open later that season.Theres only one chance every four years to experience an Olympic Games. Its something unforgettable, said Nadal, who carried Spains flag during the opening ceremony. I missed the last one in London, so I didnt want to miss this one.As a former No. 1-ranked player and a 14-time Grand Slam champion, Nadal is one of his sports central figures, so his health is a significant topic in tennis. It was a key subject on a wind-swept, star-studded second day of competition in Brazil that later saw top-ranked Novak Djokovic lose in straight sets to 2009 U.S. Open champion Juan Martin del Potro.The 2012 singles gold medalists, Serena Williams and Andy Murray, both won in straight sets.During Williams uneven 6-4, 6-2 elimination of Australias Daria Gavrilova in the main stadium, winds that reached 25 mph caused delays of about 2 hours on the eight smaller courts. Murray beat Serbias Viktor Troicki 6-3, 6-2 in less than 1 1/2 hours.Neither Williams nor Murray had played since winning Wimbledon titles a month ago. Both played doubles later Sunday alongside older siblings -- and both lost. Williams and her sister Venus are three-time gold medalists as a team but lost an Olympic doubles match for the first time, beaten 6-3, 6-4 by the Czech Republics Lucie Safarova and Barbora Strycova. Murray and his brother Jamie wasted five set points in the second tiebreaker of a 7-6 (6), 7-6 (14) exit against Brazils Thomaz Bellucci and Andre Sa.Nadals contest Sunday was his first since he surprisingly showed up at a news conference at the French Open wearing a blue brace on his left wrist and announced he would be withdrawing from the clay-court tournament he has won a record nine times.A question about the wrist arrived early in the English portion of his post-match session with reporters Sunday, and when the Spanish portion began with a query about the same topic, Nadals response started with a smile and these words: I said it in English, and Ill say it again in Spanish.He made clear both times that he didnt want to address the subject the rest of the way in Rio.Nadal appeared a tad tentative in the early going against Delbonis, a fellow left-hander who is ranked 43rd, but eventually displayed confidence with his heavy-topspin forehand, producing half of his 14 winners with that stroke.Along the way to breaking for a 3-2 lead, Nadal smacked one down-the-line forehand winner, then threw a big uppercut and yelled, Vamos -- eliciting a loud roar from spectators. There was a nearly identical celebration, and crowd reaction, when the match concluded.Nadal played cleanly, making only 15 unforced errors, while Delbonis made 31.Indeed, the one thing that truly bothered the third-seeded Nadal on this day (aside, perhaps, from the wrist questions) were the on-court digital scoreboards behind each baseline. Early in the match, Nadal complained to chair umpire Carlos Ramos that the readout made it tough to see the yellow tennis balls during points.ITF spokesman Nick Imison said the brightness was adjusted during the match to accomodate Nadal.You cant play, Nadal said, when youre losing sight of the ball.---Follow Howard Fendrich on Twitter at http://twitter.com/HowardFendrich Cheap Jerseys 2018 . - NASCAR announced a 33-race schedule for the 2014 Nationwide Series with virtually no changes from this years slate. NFL Jerseys Cheap . 10 VCU 85-67 on Thursday night at the Puerto Rico Tip-Off. 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