Streelman, the third-round co-leader, ended up at 10-under-par 274. Weekley charged up 34 places in the final round with an 8-under 63 to finish at 276.
Claiming sole possession of third place was Cameron Tringale, who registered a 5-under 66 to finish at 7-under 277 on the Copperhead Course at Innisbrook Resort and Golf Club.
Coetzee registered a 3-over 74 Sunday, tumbling into a 17th-place tie at minus-3.
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