ROVERETO: South Africa`s controversial women`s 800 metres world champion Caster Semenya flopped here on Tuesday as she could only finish seventh in a below par field.

The 19-year-old only recently returned to action after being cleared following a controversial enquiry into her gender that saw her side-lined for almost 11 months.

Semenya, who handled the furore surrounding her gender tests with great dignity, won her first three races back but failed to sparkle at the Diamond meet last Friday in Brussels and was significantly off the pace here.

Italian athlete Elisa Cusma Piccione won the race in a time of 2min 00.37sec, with Semenya - who is hoping to add Commonwealth gold in Delhi in October to her world title - over seven seconds adrift, a long way off her targetted time this season of 1min 57sec.

America`s disgraced 2004 Olympic 100 metres champion Justin Gatlin came in to the meeting with three successive wins behind him on his comeback after serving a four year suspension for doping.

However, the 28-year-old just failed to win, finishing second in 10.09sec behind up and coming 20-year-old Jamaican Yohan Blake who won in a time of 10.06sec, though he would probably have gone under 10sec had he not struggled with a right thigh problem in the last 10 metres.

South African Oscar Pistorius, known as "Blade Runner" because of the artificial legs he runs on, finished third in the 400 metres B race in a time of 47.14 seconds.

BDST: 0427HRS, SEPTEMBER 01, 2010