slugging percentage and 9.6 at bats per home run also led the major leagues, albeit without gaining the requisite number of plate appearances to qualify for rate statistic titles in either of the American or National Leagues. He was second in the major leagues in OPS (1.066), third in home runs, fourth in OPS+ (166), and sixth in adjusted batting runs (41). After the season, Martinez became a free agent for the first time of his career. Since joining the Tigers in 2014 until the end of the 2017 season, Martínez hit the 10th-most home runs in baseball while taking the second-fewest plate appearances of the top 20 home runs hitters. His slugging percentage trailed only Mike Trout, and he ranked in the top five in wOBA and wRC+, while batting .300 and .362 OBP. His .690 slugging percentage in 2017 led all MLB hitters by 59 points before adding hitless plate appearances to qualify. In terms of quality of contact, Martinez led MLB with a 49% hard contact rate, and only Aaron Judge managed more barrels per plate appearance. Martinez ranked tenth with a average batted ball distance counting hitters who produced 250 or more batted ball events. He ranked 12th with a average exit velocity, and sixth in fly balls with an average exit velocity of . Boston Red Sox 2018 season On February 26, 2018, Martinez signed a five-year, $110 million contract with the Boston Red Sox. On April 7, Martinez hit his first home run in a Red Sox uniform at Fenway Park, doing so off Chaz Roe of the Tampa Bay Rays. Martinez won the AL Player of the Week Award for the week ending on May 20, after hitting five home runs, eight RBI, .346 average, and 1.414 OPS in seven games. At that point, he had tied with teammate Mookie Betts for the major league home run lead at 15, making them the first duo in Red Sox history to both hit at least 15 home runs within the first 50 games of the season. Martinez set the franchise record for home runs through the month of June, hitting his 25th on June 28 versus Andrew Heaney of the Los Angeles Angels. The previous record of 24 had been achieved by Ted Williams (1950), Mo Vaughn (1996), Jose Canseco (1996) and Manny Ramirez (2001). Batting .329 with 27 home runs and 73 RBIs,