From Speedsolving.com Wiki
Mats Valk is a Dutch speedcuber. He currently holds the world record for the 4x4 single and average.
- Mats Valk's YouTube channel
- Speedsolving.com: Mats Valk just got a 6.84 single!
- Speedsolving.com: Mats Valk's 6.41 European Record at 2011 Dutch Open (with close up & slow mo)