Yelich and the Marlins finalized a seven-year, $49. 57 million contract extension on March 22, 2015. He struggled to start the season, and was placed on the disabled list in April with lower back strain before making his return on May 8. His batting average reached a season low of . 178 on May 22. In August, Yelich bruised his right knee and was again placed on the disabled list. Yelich had improved from his earlier offensive struggles and was hitting . 275/. 343/. 376 with six home runs, 29 RBIs and 14 stolen bases up to that point in the season. Despite aggravating the injury shortly after his return, Yelich remained an active player for the quality of his bat. Near the end of the season, Yelich shared the field with Marcell Ozuna, the outfielder who had replaced him during his second stint on the disabled list. Yelich closed the 2015 season with a . 300 average. For the season, he had the highest ground ball percentage (62. 5%), and the lowest fly ball percentage (15. 0%), of all major league hitters.