Jones added a final round of 67 at the DAP Championship to reach 11-under for the week, three behind winner Kramer Hickok but good for a share of second place.
Jones was T10 at the first of the four tournament finals series last week and has now moved to third on the cumulative money list being calculated over the four-week series.
The top 25 earn cards, Jones’ position now meaning he can’t finish outside that number irrespective of how he plays over the next two tournaments.
Davis booked his place on the main Tour with a third-place finish last week and was T16 this week to now be fifth on the money list.
The further up the standings a player finishes the better their exemption category and the more starts they earn when the new season gets underway in October.
There are nine Australians taking part in the four-tournament series which brings together the top 75 earners from the secondary Tour with those finishing 126-200 from the FedEx Cup standings.
The top 25 money winners over the four-week period will gain privileges on the main Tour next season with 25 cards already awarded to the top money winners at the end of the Web.com regular season.
Aaron Baddeley finished T16 alongside Davis at Canterbury GC in Ohio and is also currently in the top 25, dropping one place from last week to T22.
Curtis Luck is the other Australian likely to graduate to the main Tour after a T5 finish last week though a missed cut this week has added a little pressure with just two events to go.
Luck has slipped to a share of 12th on the earnings table.
Jones was solid all week in Ohio and finished in style with a birdie at the last hole which sealed his card.
Starting the day in a share of fourth position he was out of the gates quickly with an eagle at the short par-4 first though gave one back at the next.
A birdie at the seventh saw him turn 1-under and he added two more birdies against a lone bogey on the inward half to climb the leaderboard.
Hickok, who played the NSW and Australian Opens last year, led wire to wire to claim his maiden title and also assure himself a ticket to the big show in 2019.
Hickok has previously been best known for being close friends, and sharing a house with, three time major winner Jordan Spieth and will now join his higher profile friend on the main Tour.
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