KINGSTON: Jamaican sprint hero Usain Bolt won his 400-metre heat while Yohan Blake was beaten by Warren Weir on Saturday as the athletes opened their 2013 season at the Camperdown Classic.

Weir, the 200m bronze medallist at the London Olympics last year, emerged with the meet's overall 400m title with a time of 46.23sec.

Blake, the double Olympic sprint silver medallist, clocked 46.77 in the same heat.

In an earlier heat, Bolt trailed Riker Hylton - a genuine quarter-miler - into the last 40m but won the heat in 46.74.

"I felt a bit nervous," Bolt, the 100m and 200m world record-holder, said of his season opener. "I just came out here to win and I'm glad I won injury free."

Bolt, who spectacularly defended his three gold medals - in the 100m, 200m and 4x100m - at the 2012 Olympic Games in London, said he might run a couple more 400m races this season, and that his time so early in the season "shows that I am in good shape."

Blake, who said he started training a little late, was also pleased with his performance.

"I'm happy with the run, despite the time," he said. "I'm just looking forward to the rest of the season."

Meanwhile, over in Montego Bay, Asafa Powell teamed with Winston Barnes, Nesta Carter and Roman Nichol to win the men's 4x100m relay at the Milo Western Relays in 38.62.

Two-time Olympic 100m champion Shelly-Ann Fraser-Pryce anchored an MVP club quartet to victory in the women's relay in 44.03. - AFP

• Please wait.

• Rachel owes her rich vein of form to change in technique
• FIA accuses Mercedes of gaining from illegal test
• Australia's Folau in uncapped trio to face Lions
• Hurdler Pearson to return from injury next week
• Park preps for third major title bid at LPGA event
• Murray poised to end Britain's 77 years of pain
• Warburton leads eight Welsh Lions in first test
• Warburton to lead Lions in first test, North to start
• Serena Williams apologizes for rape case remark
• North fitness lifts Lions for first Test