Duane (Big Calves) Bock: On the Bag

As the FedEx Cup Playoffs begin this week, rising star Sepp Straka will once again rely on the vast knowledge, and massive calves, of Duane Bock. Find out how this top-flight PGA Tour caddie is making a big difference for Straka, and how caddying for Sepp is different than for Kevin Kisner, who has had Bock by his side for years.