After starting the year as the International Scouting Service's top-ranked prospect, Quebec Remparts forward Mikhail Grigorenko has dropped out of the top three in the organization's latest prospect rankings.
Grigorenko, who was ranked third last month, is fourth in May, losing his spot to Everett Silvertips defenceman Ryan Murray.
There was some more significant movement further down in the rankings.
USA Under-18 team member Nicholas Kerdiles jumped seven spots into 15th, while Plymouth Whalers winger Thomas Wilson climbed 10 spots to crack the top 20 at No. 17.
The biggest gain in the month was Erie Otters defenceman Adam Pelech, who moved up 16 spots and is ranked 29th in May.
The steady blueliner posted two goals and 18 assists in 44 games this season.
Nail Yakupov remains the top-ranked prospect, with the top five being rounded out by Filip Forsberg, Murray, Grigorenko and defenceman Jacob Trouba.
The 2012 NHL Draft is scheduled for June 22-23 in Pittsburgh.