GROSSETO, Italy -- East Carolina University head track & field coach Bill Carson helped guide Team USA's 4x100m and 4x400m relay team to a pair of world junior record and gold medal performances at the 10th IAAF World Junior Track & Field Championships this past Sunday.

In the 4x400m relay, Team USA cruised to the gold medal, setting a new world junior record in a time of 3:01.09 bettering the 3:01.90 set in 1990 by Team USA.

In the men's 4x100m relays, Team USA got out to an early lead and cruised to a world junior record time of 38.66 seconds --bettering the 38.92 set in 2002 by Team USA.

Team USA topped the medal table with 19 (13 gold, three silver and three bronze) - the second-best total for the USA in Championships history, only exceeded by the 2002 team. Russia was second in the medal count with 18 (seven gold, eight silver and three bronze).