Hoch, also the winner of the Greater Greensboro Classic in April, posted a total 21-under-par 267 to establish the new 72-hole record at the Western Open. The 45-year-old has recorded 10 victories on the PGA Tour.
Top-ranked Tiger Woods tied for 20th at Cog Hill to finish outside the top-10 in his third straight event. The last time that happened was in 1998, when he finished 12th at the Byron Nelson Classic, 51st at the Memorial and 18th at the U.S. Open at the Olympic Club.
Phil Mickelson, Ernie Els and Vijay Singh remained in second, third and fourth place, respectively, while Love moved up two spots to fifth on the strength of his 20th career runner-up finish.
David Duval stayed sixth in the rankings, one spot ahead of Sergio Garcia, who dropped from fifth to seventh. European Tour stars Lee Westwood, Colin Montgomerie and Darren Clarke round out the top-10.
Clarke was previously ranked 12th but climbed two positions after winning the Smurfit European Open in Ireland last week.
Canadian Mike Weir, who tied for third at the Western Open, still holds the 11th spot, while Hal Sutton rose one place to 12th and Tom Lehman fell three spots to No. 13.
Denmark's Thomas Bjorn stands in 14th place and is followed by Michael Campbell of New Zealand and Irishman Padraig Harrington. Bjorn and Harrington tied for second with Ian Woosnam at the European Open.
Jim Furyk slipped one spot to 17th, David Toms remained 18th and Hoch, ranked 29th last week, vaulted into the 19th position.
Nick Price is 20th after dropping three spots from last week.
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