Parry reached the final of the 1999 WDF World Cup Men's Singles event, beating
Marko Kantele in the last 16,
Andy Fordham in the quarter-finals and fellow New Zealander
Herbie Nathan in the semis before losing to
Raymond van Barneveld 4–1. Parry then went on to win the 2000 WDF Asia-Pacific Cup. Despite losing his opening group game to
Australia's
Tony David, Parry won his next two group games to secure qualification for the knockout stage. He defeated
Malaysia's Tengku Hadzali Shah 4–3 to win the trophy. During that time, Warren won the New Zealand Open back to back in 1999 and 2000. He went on to win it again in 2005. Parry won the 2005 Oceanic Masters beating
Russell Stewart 6–2 in the final. This earned him a place in the
2006 PDC World Championship at the
Circus Tavern in
Purfleet. He lost in the first round 3–0 to
Mark Walsh. Parry reached the final of the 2006 WDF Asia-Pacific Cup, but lost 4–3 to Amin Abdul Ghani and beat Neville Moss 5–3 to claim the 2007 New Zealand Masters. Also in 2007, Parry claimed his second Oceanic Masters title and made his second appearance in the PDC World Championship in
2008 which moved from the Circus Tavern to the larger
Alexandra Palace. He was drawn against
Alex Roy in the first round, narrowly losing by three sets to two. Parry won the 2009 Oceanic Masters and won a spot in the
World Championship for the third time. He played five-time world champion
Raymond van Barneveld in the first round, but was beaten 3–0. In 2013, Parry won the Southland Masters by defeating Stephen Padget 5–2 in the final. Later in the year he won the DartPlayers New Zealand Qualifier for the inaugural
Sydney Darts Masters, a tournament which formed the new World Series of Darts. He faced
Paul Nicholson in the first round and lost 6–4. Parry also won the Wainuiomata Open courtesy of a 7–5 victory over
Greg Moss. In 2014, Parry participated in the inaugural
Perth Darts Masters and lost 6–1 against Nicholson in the first round. A week later he qualified for the
Sydney Darts Masters as New Zealand's number one player and recorded the biggest win of his career by coming back from 5–1 to beat world number one and reigning world champion
Michael van Gerwen 6–5. Parry played
James Wade in the quarter-finals and was defeated 8–2. Parry won through to the final of the 2015 South Island Masters, where he lost 6–2 to Peter Hunt. Parry played with
Rob Szabo in the
2015 World Cup and they secured New Zealand's first win in the event since 2010 by knocking out Canada 5–4. They faced Northern Ireland in the second round with Szabo losing 4–1 to
Brendan Dolan and Parry losing 4–0 to
Mickey Mansell to exit the tournament. Parry qualified for his third
Sydney Darts Masters, but was whitewashed 6–0 by
Gary Anderson in round one. He won through to the final of the Oceanic Masters, but lost 8–4 to
Koha Kokiri. In 2016, Parry secured the South Island Masters title by beating Graeme Ryder in the final. Parry and new partner Cody Harris moved 3–1 up on Scotland in the first round of the
World Cup, but they lost 5–3. Parry and Harris contested the final of the DPA Australian Matchplay, with Harris prevailing 6–5. He was also edged out in the final of the Alan King Memorial 5–4 by
Mark McGrath. Parry won the New Zealand Qualifier for the
2017 World Championship with a 7–3 success over
Rob Szabo in the final. He lost 2–0 in the preliminary round to
Jerry Hendriks with both sets going to deciding legs. ==World Championship results==