Martin's batting average dropped to .289 in 1934, but he once again led the league in stolen bases as the Cardinals rallied from seven games behind the New York Giants in early September to win the National League pennant on the last day of the season. He made an appearance as a relief pitcher on August 19, allowing one hit in two innings pitched. In a memorable 1934 World Series against the Detroit Tigers, the Cardinals were down 3 games to 2, before rebounding to win the final two games. The series was highlighted by several rough plays on the base paths that culminated in Game 7, when Joe Medwick made a rough slide into Tigers' third baseman Marv Owen. The following inning, outraged Detroit fans pelted Medwick with debris when he assumed his defensive position in the outfield. The disturbance wasn't quelled until the umpires appealed to Baseball Commissioner Kenesaw Mountain Landis, who had Medwick removed from the game. Martin ended the series with 11 hits for a .355 average, stole two bases and scored eight runs in the series. He experienced difficulties in the field, committing 3 errors in Game 4 and setting a World Series record with four errors overall. While in a St. Louis hospital in December 1934, for a minor operation on his left arm, Martin insisted that he be entertained by a Cowboy musical group that he had hired. He created such a disturbance among the other patients that the hospital staff moved him to an isolated wing. Martin, along with Cardinals teammates such as Leo Durocher, Dizzy Dean and Joe Medwick among others, became known as the 1934 Gashouse Gang due to their boisterous activities on and off the field. He played the guitar in a hillbilly band composed of Cardinals players named The Mudcat Band.