For five years running – 2002, 2003, 2004, 2005 and 2006 – he was ranked number one according to American Darts Organisation's (ADO) points standings.
In 2005, he reached the last 32 at the Las Vegas Desert Classic and was a finalist at the Quebec Open and a member of the U.S. World Cup Team.
He played in the 2006 PDC World Darts Championship, whitewashing Lionel Sams in the first round without dropping a single leg.
He then went on to beat Dutchman Jan van der Rassel in the second round before losing to Gary Welding in the last 16.
Kuczynski then suffered a disappointing exit from the 2008 UK Open, losing in the preliminary round to pub qualifier Johnny Haines.