RIO DE JANEIRO, Brazil -- Rafael Nadal is back -- and its all about his back. Top-ranked Nadal injured his back warming up for the final of the Australian Open almost three weeks ago, eventually losing against Stanislas Wawrinka -- a match he was an overwhelming favourite to win. Nadal has practiced little since then, getting treatment at home in Mallorca. His first test comes in next weeks Rio Open, a new stop on the ATP Tour. "Well have to see how it goes," he said Friday. "I hope I can tolerate it." Nadal knows the clock is ticking. He made a comeback last season from a left knee injury, which kept him out of the 2012 London Olympics. Hes won 13 Grand Slams. Hes one behind Pete Sampras, and hes closing in on Roger Federers record of 17. Hes sure one got away in Australia. "In Australia I lost a good opportunity to add another Grand Slam," Nadal said. "It didnt happen. The opportunities are not infinite. They have an expiration date." Nadal has played more than 11 years as a professional, perhaps sustaining some injuries because of his big swings and attacking temperament. "I heard a lot of times in my career that I will have a shorter career because of my style of game," he said. "I really think its something that will not happen. If I stopped today, I already will have more than 11 years on tour." The Spaniard said hes still motivated, positive about the 2014 season. "I cannot predict the future for how long I will be here competing well," he said. "I cant say when thats going to end. The only thing I can say is today I feel happy about what I am doing. I am feeling motivation mentally to keep playing, to keep competing well." Hell be 30 when the 2016 Rio Olympics begin. He called winning gold in the 2008 Beijing Olympics "one of the best experiences" of his career. "It was a very hard moment for me when I made the decision not to play the Olympic Games in London," Nadal said. 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Danny Trevathan Jersey . -- The Oakland Athletics and free agent right-hander Bartolo Colon have agreed to terms on a US$2 million, one-year contract, bolstering their depleted starting rotation.Danny McGuire says victory over Wigan at Magic Weekend could be the shot in the arm Leeds need to turn their season around. The Rhinos sit bottom of Super League after 11 defeats in 14 games and must quickly rediscover that winning feeling if they are to finish in the top eight.Leeds have lost their last three Magic Weekend fixtures against Wigan, including a 27-12 defeat at St James Park last year, and McGuire admits nobody is giving them much chance of picking up a vital victory. I dont think too many people will be expecting us to get a result, said the Rhinos skipper.Weve had some good tussles with Wigan over the years, especially at Magic Weekends, and hopefully well have another good game on Saturday.I really enjoyed the game last year in Newcastle. The concept of Magic Weekend is still really strong and all the players enjoy it.Itll be a tough few months for us going forward. We just need to find a little bit of form and consistency.McGuire returned from a calf problem in Leeds 52-12 defeat against Castleford at Headingley last Thursday but he says injuries are not the reason for their current slump. Were just having a tough time at the minute, every team goes through that at some point. Ours is just going on a bit longer than expected. Danny McGuire Individually I think a few players have struggled at times, said McGuire. Weve been really lucky over the last few years, being involved in winning teams. We created a decent culture at the club.Were just having a tough time at the minute, every team goes through that at some point. Ours is just going on a bit longer than expected. Magic Moments Danny McGuire features in our top 10 Magic Weekend moments Weve got great players within our team.dddddddddddd Weve had a few issues outside with injuries but the main reason why were sitting at the bottom is we arent playing well enough. Its as simple as that.Hopes are high that Magic Weekend will break last years attendance record of 67,788. A large turnout by Leeds fans is expected and McGuire says the players are thankful for their support during this tough period. Phil Clarke looks ahead to Super Leagues Magic Weekend at St James Park A lot of fans stuck around and were singing at the end of the Castleford game when we had 50 points put past us, he said.Weve always had great support, wherever we go we have a great travelling fanbase and I imagine itll be the same this weekend.The players really appreciate their support and hopefully they stick with us for the rest of the year.Watch Leeds v Wigan live on Sky Sports 1 HD on Saturday from 6.45pm. 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