Jhoan Duran has proven to be one of the defining members of the Phillies' postseason push. What could Phillies' bullpen look like come October if Tim Mayza and Walker Buehler work out? Both his and Buehler's Vanderbilt education will enable the Phillies pitching coach to help the once-dominant starter carve out a place in this new era of pitching as he continues to recover from his second Tommy John surgery. Walker and Buehler share a combined 217 1/3 innings pitched as starters between the Phillies and Red Sox. The third, and final, middle reliever, righty Kerkering has continued to grow into a successful bullpen presence.