Concerned about avoiding possible injury to their young pitcher, the Mariners declared that they would limit the number of innings Hernández pitched to 200 (counting both the regular season and spring training). This required them to skip his turn in the rotation a couple times as the season went on, after the Mariners fell out of contention. To allow him to make one last start at the end of the year, the team decided to raise the limit to 205. His 191 regular-season innings were still the most on the team, and he finished 12–14 with a 4.52 ERA. His 12 victories and 176 strikeouts also led the Mariner pitching staff. He also threw the fastest fastball of all major league starters in 2006, averaging 95.2 miles per hour.