s: RHP Chad Bettis (10-6, 5.27) hasnt lost a start since July 2.

OTTAWA, Ontario -- Star Canadian pole vaulter Shawn Barber tested positive for cocaine before the Rio Olympics following a tryst with a woman he met on Craigslist.The 2015 world champion was permitted to compete in Brazil after it was determined he inadvertently ingested trace amounts of the banned substance through kissing. Barber called the positive test a complete shock.The Sport Dispute Resolution Centre of Canada made its decision Aug. 11, four days before Barber competed in Rio de Janeiro, where he finished 10th. The report wasnt released until Thursday.It was quite an ordeal going into the Olympics, but everything worked out the way it was supposed to, Barber said during a conference call.The Canadian Centre for Ethics in Sport proposed a four-year competition ban. Barber wasnt suspended but was stripped of his 2016 national title.This has been a learning experience for Shawn, Athletics Canada, the nations governing track and field body, said in a statement. He is a young athlete learning how to compete on the field of play, and prepare away from it.According to the report, Barber used cocaine July 8, the night before he won the Canadian title in Edmonton, Alberta. He had posted in the casual encounter section of Craigslist for a professional person to engage in a sexual rendezvous as a way to relieve stress. He specified he wanted a woman who was drug- and disease-free, the report said.The woman, referred to as W in the report, testified that she consumed cocaine before she met Barber and then again in the bathroom of his hotel room. She said at his hearing he could not have known shed used the drug, and she felt horrible about what happened.The woman also said she had consumed a 26-ounce bottle of vodka that night and had four or five drinks before meeting Barber. She said he declined her offer of a drink. The two did not exchange money, the report said.Arbitrator Ross Dumoulin wrote in his decision that the encounter was a pre-meditated effort by Barber to have a sex with a stranger in a hotel room. Exercising utmost caution would require him to have made inquiries to satisfy himself that there was no cocaine involved, he added.Barber was a strong hope for a medal at the Rio Olympics after winning the 2015 world title in Beijing. But he struggled in the rainy conditions in Rio.Last fall, Barbers father, George, was banned by Athletics Canada. George Barber had acted as Shawns coach until the governing body learned of his 2007 criminal conviction on charges of having sex with a student while employed at a U.S. high school. Nike Vapormax Destockage . -- Jimmie Johnson held off a teammate, passed a pair of Hall of Famers, and dominated once more at Dover. Fausse Vapormax Plus . 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DENVER -- Jayson Werth and Wilson Ramos homered, Bryce Harper doubled in the go-ahead run in the seventh inning and the Washington Nationals beat the skidding Colorado Rockies 5-4 on Monday night despite a lackluster start from Max Scherzer.Washingtons bullpen pitched five scoreless innings and Colorado-native Mark Melancon earned his 34th save in 37 chances. The NL East leaders have won three straight and four of five.Werth hit a two-run homer estimated at 442 feet in the third inning off Rockies starter Jorge De La Rosa and reached safely three times to extend his on-base streak to a career-best 43 games.The stretch is the longest in the majors this season and it ties Werth with Ryan Zimmerman for the Nationals record.DJ LeMahieu had the fourth four-hit game of his career and Charlie Blackmon hit his sixth home run in four games for Colorado. Blackmon was selected the NL player of the week after leading the majors with seven home runs last week.Still, the Rockies have lost eight of nine.Scherzer allowed seven hits and four runs in four innings.Colorado scored three in a 35-pitch first inning. David Dahl hit a two-run double with the bases loaded and Daniel Descalso added a sacrifice fly.Blackmon made it 4-2 with his homer in the fourth.Daniel Murphy hit an RBI single in the fifth, Ramos connected for a tying home run in the sixth and Harper hit his second double of the night in the seventh to give Washingtonn a 5-4 lead.ddddddddddddarper played for the second straight day after missing five games with a neck injury.WITH HONORSBlackmon also led the majors with a .563 batting average and 42 total bases last week. In seven games, he topped the NL with nine RBI and a .600 on-base percentage.Chuck is having a great year, Rockies manager Walt Weiss said. He is one of those guys who just continues to get better and I think that is directly related to his work ethic.TRAINERS ROOMNationals: Zimmerman (wrist) and C Jose Lobaton (elbow) began rehab assignments with Triple-A Syracuse. . INF Stephen Drew (vertigo-like symptoms) has increased his participation in baseball activities. . RHP Joe Ross (shoulder) will throw a bullpen session at some point during the three-game series.Rockies: RHP Tyler Chatwood (back spasms) could skip his next start or be placed on the 15-day disabled list, Weiss said. . 1B Mark Reynolds (hand) had surgery to remove a fractured hook of the hamate bone in his left hand.UP NEXTNationals: LHP Gio Gonzalez (8-9, 4.24 ERA) is 2-0 with a 3.75 ERA in two August starts. He has struck out 12 and walked two in 12 innings.Rockies: RHP Chad Bettis (10-6, 5.27) hasnt lost a start since July 2. In his last one, he gave up five runs over five innings in 100-plus-degree heat in Texas. ' ' '