Matthies will now concentrate solely on the Waves ' sand program .
Tanner takes over for Nina Matthies , whose sand team -- led by former Washington player Summer Ross -- won the first AVCA National Sand Volleyball Championships in 2012 and was the 2013 runner up .
Nina Matthies will now concentrate solely on the Waves ' sand program .
Tanner takes over for Nina Matthies , whose sand team -- led by former Washington player Summer Ross -- won the first AVCA National Sand Volleyball Championships in 2012 and was the 2013 runner up .