(IAAF Report, Aug. 22, 2010): Jamaica’s Kaliese Spencer fresh from winning the Samsung Diamond League 400m hurdles over-all prize gave world leader American Debbie Dunn a run for her money in their very close 400m encounter at the ISTAF 2010 -- IAAF World Challenge -- meeting in Berlin today.

The pair with Dunn leading were neck-and-neck almost to the tape, the American winning by 0.08secs as the 23-year-old Jamaican set a season's best of 50.64 with her teammate Shericka Williams third in 50.85secs.

The 100m sprints saw Olympic silver medalist Sherone Simpson looking a lot fitter after injury score her first victory since the Jamaican Championships in May.

Simpson powered through in the last 15 meters to win clearly in 11.09 ahead of Trinidad’s Kelly-Ann Baptiste by 0.05 with European champion Verena Sailer on home soil third in 11.24.

"It was important to win," said Simpson after her summer drought of successes. "The time does not matter. Now I want to finish the season healthy and look forward to the World Championships next year."

There was a Jamaican 1-2 in the men's event from Nesta Carter and Mario Forsythe with clockings of 9.96 and 10.11 while Caribbean neighbor Trinidad’s Richard Thompson, the 2008 Olympic runner-up, was third in 10.18.

Jermaine Gonzales the world 400m leader until superseded when beaten by Jeremy Wariner in Zurich on Thursday returned to winning ways with an easy victory in a time of 44.90. The 25-year-old former World junior silver medalist went off quickly, held a two meter lead into the home straight which he increased to over five at the finish line.

Costa Rica's Nery Brenes in a tight finish managed to steer clear of European champion Kevin Borlee by 0.17secs recording 45.47. (Check results here)