Appel arrives in big year for No. 1 draft picks
Mark Appel elated after callup to Phillies
Who is Mark Appel? No. 1 pick in 2013 MLB Draft gets first call-up from Phillies at age 30
Mark Appel: Former No. 1 pick makes MLB debut nine years after being drafted
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Former Houston Astros top draft pick Mark Appel stepping away
Stanford ace Mark Appel has moved past last year's draft
Mark Appel called up by Phillies, finally gets his shot at the major leagues at age 30
Fifteen Alumni Taken in the First Round of 2019 MLB Draft
Mark Appel Makes MLB Debut Nine Years After Being No. 1 Pick - The New York Times
Phillies' Mark Appel is finally headed to the big leagues
Mark Appel, ex-No. 1 overall pick, gets MLB call-up at 30
Former No. 1 pick Mark Appel makes MLB debut: 'God reignited that spark
Cliff Corcoran: Breaking down what each draft pick has yielded from 1990-2010 - Sports Illustrated
No. 1 MLB Draft Picks Since 1985 - Sports Illustrated