In a July 6, 2013, game against the Los Angeles Angels of Anaheim, Miller tripped and suffered a foot injury by while covering home plate after J. B. Shuck had hit a single. Podiatrist Dr. George Theodore found torn ligaments in the Lisfranc zone of his foot. As a result, Miller missed the remainder of the 2013 season. He had accumulated a 1–2 W–L with a 2.64 ERA and 48 strikeouts over innings in 37 games. He averaged a career-best 2.82 strikeout-to-walk ratio (K/BB) and career-high 14.1 K/9, the second-highest ratio for all MLB relievers with at least 30 IP. Despite his year-ending absence, the Red Sox awarded Miller a championship ring after winning the World Series.