O'Hern defeated countryman Peter Lonard on the fourth hole of a sudden-death playoff to win the Australian PGA Championship and moved up 13 places to No. 22 in the world.
Quiros, who was playing for the first time with a European Tour card, won that circuit's Alfred Dunhill Championship and leapt 148 spots to 176th.
At the top of the rankings, little changed.
Tiger Woods, of course, remained No. 1 in the world and was again followed by Jim Furyk, Phil Mickelson, Adam Scott, Retief Goosen and Vijay Singh.
Padraig Harrington moved up one place to seventh, dropping Ernie Els to eighth. Luke Donald, Sergio Garcia, Geoff Ogilvy, Henrik Stenson, Trevor Immelman and Paul Casey remained in positions 9-14.
David Howell and Davis Love III were each up one spot to 15th and 16th, respectively, knocking Colin Montgomerie to 17th. Jose Maria Olazabal, David Toms and Chris DiMarco rounded out the top 20 again.