Aye, thought about Kiefer for the reasons you say. Also at home and looked good against Mathieu. Problem is Wawrinka is on a big roll and has just hit the top 10, think he'll be pretty tough to beat. I'd reccommend taking Kiefer at a 1 ball or at least a 1 set bookie, as there's a chance Stan is still struggling with his back.
Good luck with Kiefer
