by Jeff FletcherFiled under: Giants, Rockies, NL WestSAN FRANCISCO -- The Giants are often maligned for putting too much emphasis on the back of the baseball card, counting on players to repeat the past.For relying on players like 34-year-old Edgar Renteria, who has two sore shoulders and an elbow that needs surgery in the offseason. Renteria is clearly past his prime.That said, Renteria will always be a part of a very select club. Renteria is one of just five players to have a walk-off hit t...