Mike Mazzei holds a strong lead in trader assessments for the Oklahoma Republican gubernatorial primary runoff winner, driven primarily by Donald Trump’s May endorsement and Mazzei’s sustained advertising push emphasizing property tax relief, education reforms, and pro-growth policies. The June 16 primary produced a near-tie, advancing Mazzei and state Attorney General Gentner Drummond to the August 25 runoff after both edged out Charles McCall, Chip Keating, and lower-polling candidates. Recent polling shows a tightening or slight Mazzei edge in head-to-head matchups among likely Republican voters, reflecting shifts in support since the initial primary results. Drummond’s established statewide profile as attorney general and focus on cost-of-living and rural infrastructure issues maintain a competitive position, though traders view the combination of endorsement momentum and late-campaign dynamics as tilting probability heavily toward Mazzei in the final week.