Recalled by BOS in late May and made 21 starts as a 22-year-old in debut ML season, going 10-6 with a 3.85 ERA (52 ER/121.2 IP). Honored as the Boston BBWAA's Red Sox Pitcher of the Year and Red Sox Rookie of the Year in his 1st full season in the organization. Went at least 5.0 IP and allowed 1 or no ER in 12 of his starts, tying for the most such starts through any player's first 21 career ML games since at least 1914 (also Stephen Strasburg, Matt Harvey, Dwight Gooden, Cal Eldred), the most by a LHP...Matched Gooden (1984) as the only pitchers with 12 such starts within their first 21 games, all in the same season. His 21 starts were the most in a season by a Red Sox rookie since Daisuke Matsuzaka in 2007 (32 starts), most by a left-handed Sox rookie since John Curtis in 1972 (21 starts). Among Red Sox pitchers with at least 100.0 IP, ranked 1st with a .255 opponent AVG (120-for-471)...Finished 2nd among that group in ERA and WHIP (1.29), trailing only Clay Buchholz (3.26 ERA, 1.21 WHIP in 113.1 IP). Led AL rookies in wins and finished 2nd among left-handed AL rookies with both 98 SO and 13 quality starts...Was the Red Sox' 1st left-handed rookie to reach double digits in wins since John Curtis in 1972 (11- 8)...His 13 quality starts were most by a lefty rookie with BOS since Hal Wiltse in 1926 (15). Was the 1st Red Sox pitcher to win at least 10 games and post a sub-4.00 ERA before turning 23 since Mike Nagy in 1969...Was the 1st Red Sox left-hander to do that since Babe Ruth in 3 straight years, 1915-17 (Source: Elias). Recalled from Triple-A Pawtucket on 5/28 and made ML debut that night at TEX (7.2 IP, 3 H, 0 R, 2 BB, 7 SO)...Became the 1st pitcher in Red Sox history to go at least 7.2 IP, allow no runs, give up 3 hits or less, and strike out as many as 7 batters in his ML debut...Was the longest scoreless outing for a Red Sox in his ML debut since Billy Rohr on 4/14/67 at NYY (9.0 IP). Was 22 years, 51 days old on 5/28, the youngest Red Sox left-hander to start and win his ML debut since Billy Rohr at 21 years old in 1967...Was the youngest pitcher to make his ML debut as a starter for the Red Sox since Michael Bowden at 21 years old on 8/30/08 vs. CWS, the youngest Red Sox LHP to do it since Abe Alvarez at 21 years old on 7/22/04 vs. BAL. Had a 0.44 ERA (1 ER/20.2 IP) after his first 3 starts, allowing 1 ER and 8 hits total while striking out 21 over 20.2 IP...According to Elias, was the 1st pitcher in baseball history to go at least 6.0 IP while allowing no more than 1 run or 3 hits in each of his first 3 ML games...Elias also says he was the 1st pitcher to begin a career with 3 straight starts of 6.0+ IP, 7+ SO, and 1 ER or fewer since ER became an official stat (1912 in NL, 1913 in AL). Allowed 10 total ER over his last 7 starts beginning 8/18...His 2.08 ERA (43.1 IP) in that stretch ranked 2nd in the AL to CLE's Cody Anderson (1.66) and 3rd in the majors among LHP, trailing only PIT's J.A. Happ (1.34) and LAD's Clayton Kershaw (1.53). Posted an AL-best 1.87 ERA (17 ER/81.2 IP) in 13 night games, trailing only CHC's Jake Arrieta (1.51) among all major leaguers (min. 75.0 IP)...Had a 7.88 ERA (35 ER/40.0 IP) in 8 starts during the day. Held opponents to a .229 AVG with RISP (24-for-105), including just 5-for-46 (.109) with RISP and 2 outs. Went 3-1 with a 2.22 ERA (6 ER/24.1 IP) in 4 starts against the Yankees...Was the 1st Red Sox pitcher to beat the Yankees 3 times in a season before turning 23 since Mike Nagy in 1969 (3-0), and the 1st Red Sox LHP to do it since Babe Ruth in 1917 (5-0). Began the year with 8 starts for Triple-A Pawtucket...Went 4-3 with a 2.98 ERA (16 ER/48.1 IP) and 44 SO compared to 7 BB before his call-up. Following the season, ranked by Baseball America as the No. 5 prospect in the International League.
Acquired by the Red Sox at the trade deadline...Spent the regular season in the Double-A Eastern League between the Orioles' Bowie affiliate and Double-A Portland, going 6-8 with a 3.60 ERA (48 ER/120.0 IP) and 108 strikeouts in 22 combined starts...Ranked 3rd among EL leaders with 8.1 SO/9.0 IP and was 10th in ERA...Held left-handed hitters to a .216 AVG (29-for-134) without a HR...Began the year with BAL's Double-A Bowie...In 16 starts, went 3-7 with a 4.79 ERA (44 ER/82.2 IP)...On 7/31, was acquired by BOS in exchange for LHP Andrew Miller...Allowed 4 total runs in his 6 regular season starts for Portland following the trade (0.96 ERA)...Allowed 1 or no runs in all 6 starts...From 8/1 through the end of the regular season, led the EL with 39 strikeouts in his 37.1 innings for the Sea Dogs...Allowed only 30 hits and 8 walks...Won his Red Sox organizational debut on 8/3 vs. Trenton, striking out 7 and allowing 1 run in 5.1 IP...Posted a 2.39 ERA (21 ER/79.0 IP) over his last 14 regular season starts beginning on 6/18...Allowed 3 runs (2 ER) with 6 strikeouts over 6.2 innings in a playoff start for Portland in an eventual 6-3 win in Game 3 of the Eastern League Division Series vs. Binghamton...Made his Triple-A debut in Game 4 of the Governors' Cup Finals at Durham and allowed 2 ER in 7.0 innings, a 4-3 PawSox win in 13 innings...Following the season, recognized by Baseball America as the No. 4 prospect and as possessing the best fastball among Red Sox minor leaguers.
Posted a 2.85 ERA (86.0IP, 27ER) in 14 starts with Single-A Frederick before being promoted to Double-A Bowie in late June...Named Organizational Pitcher of the Month in May, when he went 5-0 with a 2.23 ERA (41.0IP, 10ER) in six starts...Selected to Carolina League Mid-Season All-Star Team and pitched a scoreless inning in the All-Star Game...Named to MLB All-Star Futures Game and pitched a scoreless inning, striking out one...Named the O's No. 3 prospect after the season by Baseball America...Was named a top 100 overall prospect by ESPN.com (43), Baseball Prospectus (61) and MLB.com (68)...Pitched for Surprise in the AFL after the season, earning the win in the championship game, starting and tossing 3.0 scoreless innings (2H, 4K).