Dunlap outscored the East Peoria boys basketball team 27-12 in the middle two quarters Friday.
That shortfall was too much to overcome for the Raiders in a 51-32 Mid-Illini Conference loss in their final regular-season home game.
Sean Mulhern and Kieran Buckley had nine points apiece to top East Peoria, which got swept by the Eagles.
The Raiders trailed just 13-12 after one quarter at Allison Gymnasium before a 13-4 deficit in the second.
Max Graham (19 points) and Alex Sorenson combined to score 34 for Dunlap.
Pekin 44, EP 30
The Raiders again were close after the opening quarter Saturday before getting knocked off by a league foe.
East Peoria (2-21, 1-12) was down only 13-12 through eight minutes at Dawson Hawkins Gymnasium.
Pekin, however, outscored the Raiders 25-9 combined in the second and fourth periods.
Mulhern scorched the Dragons for a game-high 18 points. He hit three 3-pointers.
Pekin rose to a second-place tie in the M-I when Metamora lost at Washington on the same night.
East Peoria dropped to eighth in the conference when host Morton throttled Canton.
Zac Hansen's 15 points paced the Dragons, who became the fourth league team to reach 17 victories.
Postseason: East Peoria plays Morton (4-22) at 7:30 p.m. Monday in the quarterfinals of the Class 3A East Peoria Regional.
It will be the second meeting between the rivals in three days.
The winner advances to play No. 1 seed and third-ranked Washington (26-1) at 6 p.m. Tuesday in the semifinals.