Glasgow: It was only a matter of time before a doping scandal hit the Commonwealth Games. This time, it involved a 16-year-old female weightlifting gold medallist from Nigeria.

Chika Amalaha tested positive for the diuretic amiloride and masking agent hydrochlorothiazide — both banned by the World Anti-Doping Agency — after winning the 53-kilogram weight class last Friday, games officials said on Tuesday.

She’s the first athlete to test positive during the games, which opened last Wednesday night.

Amalaha asked for the backup “B” sample to be tested, which will happen in London on Wednesday. If that sample also comes back positive, she will be stripped of her medal.

“It shows we have a very robust anti-doping programme in place,” Commonwealth Games Federation chief executive Mike Hooper said. “It sends a strong message to anybody in any sport that if you go down the path of doping, any substance to enhance performance, they will be caught ... it’s an ongoing battle.”

It’s the second Commonwealth Games in a row that Nigeria has been in the doping spotlight. Four years ago in New Delhi, three of the four doping cases involved Nigerian runners, including women’s 100-metre gold medallist Osayomi Oludamola.

Meanwhile, shooter Harpreet Singh opened India’s medal count on Tuesday by clinching the silver in the men’s 25-metre rapid fire pistol finals at the Commonwealth Games here.

Australian David Chapman won the gold in style, setting a new Finals Games Record (FGC) with a final score of 23 while Harpreet took the silver with 21. England’s Kristian Callaghan clinched the bronze with 17 at the Barry Buddon Shooting Centre.

Chapman and Harpreet were level at 19 points on the seventh and penultimate round but the 49-year-old Australian shot a series score of 4 in the last round to the Indian’s 2, which gave him the yellow metal.

This is Harpreet’s third medal at the Commonwealth Games. The 33-year-old Karnal born had also won two golds in the 2010 Delhi Games in 25m centre fire pistol — in pairs and individual events.

Earlier on Tuesday, Olympic silver medallist Vijay Kumar failed to qualify for the finals.

In Stage 2 of qualification, Harpreet finished fourth with a total score of 281 points while Vijay could only manage 274 to end his campaign in eighth as only the top six qualified.

Harpreet had topped Stage 1 of qualification on Monday evening while Vijay had finished fourth.

India mid-fielder Manpreet Singh and forward Gurwinder Singh Chandi got their 100th cap against Australia in their penultimate group game in the hockey competition at the 2014 Commonwealth Games here on Tuesday.

Chandi is making a comeback in the national side after one and a half years. He made his international debut in the Four Nations Cup in Australia in 2008. He even represented India at major tournaments including Men’s World Cup in 2010, London Olympic Games in 2012 and Champions Trophy in 2012.

The 22-year-old Manpreet Singh made his international debut at the Asian Champions Trophy, Ordos in 2011. Since his debut, Manpreet has represented India in almost all the major tournaments including London Olympic Games in 2012, Champions Trophy in 2012, Asia Cup in 2013 and FIH Men’s World Cup.

Hockey India (HI) secretary general Narinder Batra congratulated the players.

“Hockey India is pleased to see a well rehearsed performance by both Manpreet Singh and Gurwinder Singh Chandi during their XX Commonwealth Games 2014 outing. The timing of them both completing their 100th international cap couldn’t have been better. I believe this achievement on a world class platform will motivate them to perform even better in the remaining matches of the tournament,” he said in a statement.

In the pool, the Australians were fastest in the morning session in both the men’s and the women’s 4x100m medley relays, having previously taken gold in the men’s and women’s 4x100m and 4x200m freestyle relays.

However, South Africa were expected to challenge for top spot in the men’s event with butterfly specialist Le Clos to come into the team that qualified fifth fastest.

Games table toppers Australia have already won 17 golds in the pool with the men’s and women’s 4x100m individual medleys among the final eight titles on offer.

In the track and field over at Hampden Park, the men’s 110m hurdles was blown wide open when England’s defending champion Andy Turner pulled up and Jamaica’s Olympic bronze medallist Hansle Parchment was a non-starter.

Turner was off-kilter out of the blocks, clipped the first two hurdles and pulled up before stumbling into the third to bring a premature, and angry, end to his Games’ participation.

Canada’s Damian Warner remained atop the decathlon as teammate and world silver medallist Brianne Thiesen-Eaton kicked off the heptathlon as massive favourite.