Kevin Chappell 7.6
Paul Casey 8.6
These looks fair odds on Chappell, who has a one-shot lead over the rest of the field; he is 0-for-3 when leading after 36 holes on the PGA Tour, but this will the third time this season that he has been in this position so those experience should help him, plus he also has a good record on this course - he was 3rd at this stage of the event last year
Casey is one shot back in 2nd place and has the experience to capitalise if Chappell falters and also hold off Dustin Johnson, the bookies' favourite who is two shots behind the Englishman