I have work to do - Bolt ... Sprinter clocks 9.98 seconds for Ostrava win

Jamaican sprinter Usain Bolt was certainly not satisfied after his 9.98-second win in the 100m at yesterday's Golden Spike meet in Ostrava, admitting that he has a lot of work to do to get up to speed.

Bolt walked out of the starting blocks before building up some power midway the race and powering to the finish line without company.

"The power behind the start wasn't there. I didn't execute," said the Jamaican. "I had to get to work a little bit harder at the end to get up the speed."

"If I can improve that, it should be OK."

Bolt is next scheduled to compete at the Racers Grand Prix in Kingston on June 11, the National Senior Championships and then at the London Diamond League meet on July 22 before the Rio Olympic Games.

However, despite posting his first sub-10 clocking of the season, the defending double Olympic sprint champion believes he still has a lot of work to do ahead of the Olympic Games.

"This is a very important season. This is a very big year for me," said Bolt. "I have a lot work to do. I just need to continue, need more races to go."

Ramon Gittens of Barbados finished second in 10.21, with Iran's Hassan Taftian finishing third in 10.25.

Other Jamaican winners included Christine Day and Javon Francis, while Kaliese Spencer had to settle for second place, with Jaheel Hyde falling before the end of his 400m hurdles event.

Francis ran a well-paced race for his 400m victory, which arrived in 44.87 - his third straight sub-45 seconds clocking this season. USA's Tony McQuay, 45.17 was next best with home boy Pavel Maslak, 45.46 finishing third.

WOMEN'S 400M

Day was commanding in her 51.09 win in the women's 400m ahead of Carline Muir (Canada), 51.84 and Jessica Beard (USA), 51.88.

Kaliese Spencer, 55.43, was out-sprinted by Joanna Linkiewicz (Poland), 55.40 with world champion Zuzana Hejnova (Czech) 55.69 taking third place.

Young Hyde fell in his 400m hurdles event after clipping the seventh hurdle as he made his way around the 200m bend very much in the thick of the action with the event eventually going to South African LJ van Zyl, 48.67 with Johnny Dutch (USA), 49.01 finishing second and Patryk Dobek, 49.51 ending in third place.

Another highlight came from Olympic champion Renaud Lavillenie, who didn't meet his 6.00m ambition after clearing 5.83m to win the pole vault, beating World champion Shawnacy Barber, who made 5.70m.

Decathlon Olympic and World champion Ashton Eaton withdrew after two jumps in the long jump

"During the second jump, I felt something happen in my left quad," Eaton said. "I don't know what happened, but I don't want to take a risk in the Olympic season."