Napavine sophomore James Grose exploded for a game-high 30 points to go with 12 rebounds and four steals as Napavine outgunned Stevenson for a 67-46 road win on Friday.
Grose shot 12 of 23 (52%) from the field, including 5 of 9 (56%) from beyond the arc.
Keith Olson added a monster double-double of 10 points and a game-high 16 rebounds and three blocks as the Tigers dominated the boards, 47-21.
Senior Gavin Parker provided another scoring punch with 15 points and seven rebounds.
Napavine held the Bulldogs to just five points in the second quarter to take a commanding 37-16 lead at the break before cruising to victory.
The Tigers shot 48% from the field (27 of 56), including 30% from downtown (7 of 23), while limiting the Bulldogs to 29% shooting from the field and 25% from 3-point land (7 of 28).
Napavine (13-2, 7-1 C2BL) heads to Morton-White Pass on Wednesday.
