Anton De Pasquale briefly threatened to take sixth from the 2015 champion after his Race 10 win, but an engine-related DNF in the finale consigned the #11 Shell V-Power Racing Team driver to seventh, 49 points behind Winterbottom.
Regardless, The Bend was the scene of another resurgence for De Pasquale, who after the second round at Sandown, was a lowly 17th in the standings.
This is where the tightest battle in 2021 lies; the midfield.
The drivers from De Pasquale in seventh and Todd Hazelwood in 17th are covered by just 131 points.
WATCH: RACE 10 RECAP
David Reynolds was the biggest loser at the OTR SuperSprint, slumping from seventh to 13th overall.