[2] He attended Fayette County High School, where he played baseball, and, during his senior season, won team most valuable player accolades.

He played for Georgia State during the 2010 season, and was the team's top pitcher, earning several honors from the Colonial Athletic Association before a finger injury caused him to miss significant time.

[4] He began his professional career in 2010 as a member of the Williamsport Crosscutters, with whom he started 13 games, losing only one of them, and recording a 4.21 earned run average (ERA).

[2] His steady advancement through the minor league system continued in 2012; the next year, he spent a full season with the Reading Fightin Phils of Double–A.

[2] After splitting his time in the 2013 season between the Fightin Phils and the Lehigh Valley IronPigs (Triple–A – International League),[5] Buchanan attended a Prospect Education Program hosted by the Phillies organization in January 2014.

"[12] With his college coach on hand to witness a "monumental time in Georgia State baseball history", Buchanan made his major league debut against the Los Angeles Dodgers on May 24, 2014.

After recording a 8.76 ERA giving up 15 walks and 32 hits in first 5 starts to begin the season, the Phillies optioned Buchanan to Lehigh Valley, calling up left-handed relief pitcher Elvis Araujo from Double-A Reading in his place.

[15] Buchanan was called back up on July 7, 2015, to fill the starting rotation in place of Kevin Correia and Sean O'Sullivan, who were designated for assignment.

[27] On December 16, 2021, Buchanan again re-signed for the 2022 season after tying the league-high in wins (16) and setting franchise records for most victories and innings pitched by a foreign player in 2021.

[38] Also similar to Kendrick, many fans and others have overlooked Buchanan during his minor league tenure; he did not receive any interview requests during the Reading Phillies' media day in 2012, despite being one of the team's top starting pitchers.

[6] An article in The Times Herald asserted, "Most of what gets Buchanan overlooked are the things that get his pitching compared to Kendrick’s: He isn’t overpowering, but he uses a sinker and control on the corners to coax ground balls and keep his team in games.

That capability has earned Kendrick 153 starts and 64 wins over the last seven seasons with the Phillies, not to mention a $7.7 million deal in 2014 as he approaches free agency.

"[38] Buchanan also possesses a strong work ethic – instead of talking to the media or celebrating with teammates after throwing seven scoreless innings and striking out nine, he completed a 45-minute medicine ball workout.