Sander Kaasjager, who also goes by the pseudonym Vo0, is a former Dutch professional player of the first person shooter game Painkiller, born in Naarden. He was formerly signed on to play for the electronic sports team Fnatic. When the Cyberathlete Professional League, World Series of Video Games, and other tournaments dropped Painkiller in favor of Quake 4, Kaasjager retired from professional gaming on June 21, 2006 to pursue his studies for the upcoming college semester.
Originally starting with Quake II, Kaasjager later rose to widespread popularity with the release of a self-made montage of highlight footage (or "frag video") from the game Challenge ProMode Arena. Which showcases Kaasjager's unique aggressive style of playing.
Kaasjager has won more professional Painkiller tournaments than any other player. He has competed in multiple professional gaming tournaments around the world. Kaasjager won two world championship titles, one with the CPL, and one with the ESWC, both in 2004.
In 2005, Kaasjager competed in the 2005 CPL World Tour, in which he won at five out of nine stops and earned $223,000. Kaasjager was named the Most Valuable Player of the tour. Overall, Kaasjager won over $250,000 in prize money at professional Painkiller tournaments, more than any other player.
- 4th – Intel Extreme Masters season IV American Championship finals Quake Live – 1on1 (Edmonton, Canada)
- 1st – Dreamhack Summer CPM Quake III Championship – 1on1 (Jonkoping, Sweden)
- 7th – QuakeCon Intel Quake Live 1v1 Championship – 1on1 (Dallas, Texas)
- 8th – GameGune 2008 – 1on1 (Bilbao, Spain)
- 13th – Electronic Sports World Cup Masters – 1on1 (Paris, France)
- 2nd – Electronic Sports World Cup qualifier – 1on1 (Enschede, Netherlands)
- 2nd – World Series of Video Games, China – 3on3 (Wuhan, China)
- 2nd – CPL World Tour Grand Finals – 1on1 (New York City, U.S.)
- 3rd – CPL World Tour Stop Chile 2005 – 1on1 (Santiago, Chile)
- 1st – CPL World Tour Stop Italy 2005 – 1on1 (Milan, Italy)
- 2nd – CPL World Tour Stop Singapore 2005 – 1on1 (Singapore, Singapore)
- 1st – CPL World Tour Stop UK 2005 – 1on1 (Sheffield, UK)
- 2nd – CPL World Tour Stop USA 2005 – 1on1 (Dallas, U.S.)
- 1st – CPL World Tour Stop Sweden 2005 – 1on1 (Jönköping, Sweden)
- 1st – CPL World Tour Stop Brazil 2005 – 1on1 (Rio de Janeiro, Brazil)
- 2nd – CPL World Tour Stop Spain 2005 – 1on1 (Barcelona, Spain)
- 1st – CPL World Tour Stop Turkey 2005 – 1on1 (Istanbul, Turkey)
- 1st – CPL World Tour Spain Qualifier 2005 – 1on1 (Istanbul, Turkey)
- 1st – CPL Extreme Summer Championships 2004 – 1on1 (Dallas, U.S.)
- 1st – CPL Extreme Winter Championships 2004 – 1on1 (Dallas, U.S.)
- 1st – Electronic Sports World Cup 2004 – 1on1 (Poitiers, France)
- 1st – Netgamez 2004B – 1on1 (Nieuwegein, Netherlands)
- Most Valuable Player CPL World Tour 2005
- (ESports Award) eSports Player of the Year 2005
- (ESports Award) Newcomer / Breakthrough of the Year 2005
- CPL World Champion 2004