RIO DE JANEIRO -- Mack Horton called Chinese swimmer Sun Yang a drug cheat, and then went out and dethroned the defending Olympic champion in the 400-meter freestyle.Horton won his first Olympic gold medal with a time of 3 minutes, 41.55 seconds Saturday night before the Australian women capped the first night of swimming with a world-record victory in the 4x100 freestyle relay.Sun finished second.After the preliminaries, Horton was asked about a reported incident between him and Sun at the practice pool earlier in the week. The Aussie said Sun splashed me to say hello, and I didnt respond because I dont have time for drug cheats.In 2014, Sun served a three-month suspension for using a banned stimulant.The last 50 meters I was thinking about what I said and what would happen if he gets me here, said Horton, who beat Sun by just 13-hundredths of a second. I didnt have a choice but to beat him.Horton was asked by a Chinese reporter why he described Sun that way.I used the words drug cheat because he tested positive, the Aussie said. I just have a problem with athletes who have tested positive and are still competing.Horton celebrated his victory without even acknowledging Sun in the lane next to him. Sun made a move as though he wanted to congratulate Horton, but the winner looked the other way. They got out of the pool together but acted as if the other didnt exist.I dont think we need to care too much about what the Australian says, Sun said through a translator. Ive got a gold medal (from 2012) and my world ranking. I dont need to prove myself anymore.Still, Sun defended himself after the race.I am clean, he said. Ive done whatever it takes to prove Im a clean athlete.Horton and Sun finally gave each other a begrudging handshake on the medal stand, but that was about it.Sun described the last four years as being tough, in part because of mistakes hes made.In November 2013, he was caught driving without a license after an accident in China. At last years world championships in Russia, he was accused of an altercation with a female Brazilian swimmer in the warm-up pool and then he failed to show up for the 1,500 freestyle final.Ive learned, the 24-year-old Chinese swimmer said. I know now to face up to failure and have a broader perspective. Those are invaluable lessons to me. All those hard-learned lessons will guide me through the rest of my life. Being young, sometimes you can get a bit naughty. You dont have a lot of common sense. Nike Basketball Shoes Sale . Numbers Game looks into the Canadiens securing the services of Thomas Vanek in a trade with the New York Islanders. 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The medical staff initially thought hed torn the ligament, and the test a day later in Cincinnati confirmed it.Former England forwards coach Graham Rowntree has been confirmed in a new-look management set-up at Harlequins. Rowntree, who has been out of work since leaving his role with England following the disappointing 2015 World Cup campaign, will provide assistance to new Quins head coach Mark Mapletoft from the start of next season. To have the opportunity to coach at such a prestigious and historic club really excites me, Rowntree told the clubs official website. Harlequins has a very talented playing squad with a wealth of top class experience and a fantastic crop of youngsters. I cant wait to join up with the new coaching group and get started.John Kingston - a key part of the Quins coaching set up since 2001 - will replace director of rugby Conor OShea, who is leaving to become Italy head coach. Im immensely proud of what I have achieved in the last eight years as head coach and taking the role of director of rugby is an exciting and well timed new challenge for me, Kingston said. Conor OShea is leaving Harlequins to become Italy head coach Conor OShea will leave a lasting legacy on this club with the success we have achieved over the last six years and it is something I am excited to build on heading into our 150th year.dddddddddddd He has made a massive impression on me, the squad, staff and supporters and we know he will be greatly missed by the whole club. Im looking forward to getting the best out of a great group of players and a wonderfully exciting new coaching group during the next era for Harlequins.Former England back row forward Nick Easter completes the backroom team, becoming Quins new defence coach. OShea will leave Quins at the end of the season following six years with the club. The Irishman, who led Quins to the Aviva Premiership title in 2012, will be assisted in his new role with Italy by England World Cup winner Mike Catt. Also See: Day to leave Bath for Japan Premiership home Sinfield announces retirement Rugby Union on Sky ' ' '