PHILADELPHIA, USA -- The announcement that double world record-holder Usain Bolt is returning to the Penn Relays has had the desired impact on the ticket office as Saturday's third day is almost completely sold out.

A check with the ticket office at Franklin Field at the University of Pennsylvania at midday yesterday showed that only a few dozen seats were left on the north-west corner of the stadium.

A ticket representative told the Observer that after it was announced that Bolt would be competing on Saturday, for the Jamaican team in the 4x100m relays, request for tickets spiked and that by Monday all the tickets along either of the straightways had been completely sold out.The Observer also saw persons buying upwards of 20 tickets yesterday and one man was heard talking to his friends on his cellular phone that he could not get tickets in the section they always sat and was asking whether another section would be okay.

Bolt, who has not run here in four years, is expected to take part in the 4x100m race in the US vs The World Series.

Jamaica has won this event once -- in 2008 with a team of Marvin Anderson, Michael Frater, Nesta Carter and Dwight Thomas in 39.04 seconds.

Bolt was part of the Sprint Medley Relays team in 2005 and Jamaican teams have won a total of eight times in the series that started in 2000.

The weather forecast for Saturday is calling for rain and cool temperatures with a high of six degrees Fahrenheit.

Jamaican high schools will be well represented here with 39 teams down to take part in the event that starts on Thursday.