The United States Anti-Doping Agency (USADA) is investigating Nate Diazs open use of a vape pen shortly after his riveting five-round fight against Conor McGregor at UFC 202.I can confirm that USADA is aware of the situation and is currently gathering information in order to determine the appropriate next steps, said USADA spokesperson Ryan Madden.During Saturdays postfight press conference, Diaz, who suffered a majority decision loss to McGregor at T-Mobile Arena in Las Vegas, openly vaped while answering media questions.When asked what substance the pen contained, Diaz, 31, said it was CBD oil -- otherwise known as cannabidiol. Cannabidiol is considered a banned substance in-competition, under the classification of cannabinoids.CBD oil, Diaz said when asked about the vape. It helps with the healing process and inflammation, stuff like that. You want to get these before and after a fight, training. Itll make your life a better place.The in-competition window extends to six hours after a UFC fight. Diaz submitted a fight-night drug test prior to the news conference, the results of which were not yet available. The threshold for marijuana metabolites under the UFC program, as well as statutes of the Nevada State Athletic Commission, is 150 nanograms per milliliter (ng/mL).The USADA could argue Diazs admission of using CBD oil within a six-hour time frame is a violation of the UFCs anti-doping policy. If the USADA were to rule a violation has occurred, Diaz could face up to a one-year suspension.Diazs representatives were not immediately available for comment.Diaz (19-11) has never failed a drug test. His older brother, UFC welterweight Nick Diaz, recently completed an 18-month suspension for his third marijuana-related offense. Nate Diaz, who fights out of Stockton, California, already has called for a trilogy fight against McGregor. Mohamed Bamba Jersey . 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As rugby sevens prepares to take its Olympic bow in Rio, these are the players to watch out for when the womens competition kicks off on Aug. 6 and the men get started on Aug. 9.Collins Injera (Kenya) A sevens legend who is the record try-scorer on the World Rugby Sevens Series circuit with 235 and one of Kenyas most recognised sports stars. Away from the sport, he works full-time for a PR company in Nairobi but his focus in Rio will be on trying to steer his teams way through a pool featuring New Zealand, Great Britain and Japan.Emily Scarratt (Great Britain)?She has won the World Cup in 15s with England and will skipper Team GB at Rio. In 15s she has developed one of the most accurate kickers in world rugby but possesses a scything sidestep which sees her create space for herself and teammates.Sonny Bill Williams (New Zealand) The box-office star of Olympic sevens. In the 15-man form of rugby he has won the World Cup twice, and also has rugby league and boxing titles to his name. His hero is Muhammad Ali and his fame will give him a cachet beyond his sport at the Olympics. His offloads are sensational and the achievement of transferring from 15s to sevens in the space of just a year cannot be underestimated.Ellia Green (Australia)She could have been a short-distance track athlete such is her pace and she will light up Rio with her blistering speed. Australia headed to Rio as favourites for the womens crown and Green will be integral to their medal charge. To get an idea of her ability, have a look at this try from the Gold Coast Sevens in October 2014.Seabelo Senatla (South Africa)The Blitzbokke star was the top try scorer in last seasons sevens series with 66 and is one of the most lethal finishers in the sport. He has Super Rugby experience having played for the Stormers and, aged just 23, he could have a fine career on the international stage in 15s. With the likes of Springboks superstar Bryan Habana missing out on a space in the South Affrica squad for Rio, expect big things from Senatla and his teammates.ddddddddddddPortia Woodman (New Zealand)?She comes from a rich New Zealand rugby heritage with both her father and uncle playing for the All Blacks in the 1980s. She was crowned World Rugby Sevens Player of the Year in 2015 and is also a gifted netball player and her try-scoring pedigree is second to none on the circuit.Tom Mitchell (Great Britain) Team GBs build up has been less than ideal. England, Wales and Scotland played apart on the Sevens Series and have only had four tournaments together under the united umbrella. But Mitchell, who will captain Great Britain in Rio, is one of the games finest playmakers and is a hugely impressive individual both on and off the field.Perry Baker (USA) Even Senatla says that Perry Baker and his U.S. teammate Carlin Isles are quicker than him. Thats no mean feat. Baker grew up playing college football and was signed by the Philadelphia Eagles only for an injury to curtail his chances of playing in the NFL. He is frighteningly quick and if the U.S. get on the front foot with the brilliant Madison Hughes pulling the strings, Baker could be one of the stars of the Games.Ghislaine Landry (Canada) Landry was the top points scorer in last seasons Sevens Series with 158. She has a degree in human kinetics and her nickname is the pocket rocket. Her goal at Rio is simple: to win and create a legacy so the game continues to grow in Canada.Savenaca Rawaca (Fiji) The great Fiji coach Ben Ryan rates Rawaca highly and so do Premiership side Saracens whove signed him ahead of next season. Fiji are the team to beat in the mens side of the tournament and when you cast your eye across their incredible squad, it is easy to see why. You could pick any one of their 12-strong party for a player to watch but Rawaca should be superb. 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