Graduated from Norwich Free Academy (Conn.) where he played high school baseball and was an All-State selection his junior and senior seasons ... Was rated as the No. 1 prospect in Connecticut during his senior season by Perfect Game ... Played college baseball at Clemson University ... Posted a 16-8 record with a 4.63 ERA over 208.0 career innings in college and as a freshman helped lead Clemson to the 2010 College World Series (the first College World Series at the new TD Ameritrade Field) in which he made two appearances covering 3.0 innings including a start against arch-rival and eventual National Champion, South Carolina ... Played for Chatham in the 2011 Cape Cod League ... Taught himself how to throw a cut fastball by watching YouTube videos of Mariano Rivera ... Resides in Mount Pleasant, South Carolina.
Posted Major League career highs with 65 appearances, 70.1 innings pitched and 81 strikeouts ... Was one of four Blue Jays pitchers to appear in 65 or more games (Tepera 73, Loup 70, Osuna 66) ... Ranked 12th in ERA (2.56) 9th in innings pitched (70.1) among American League relievers ... Ranked T3rd among American League relievers in Inherited Runners with a career-high 54 and T13th in Inherited Runners Scored percentage (22.2%) ... Held opposing batters to a .202 BA, 2nd-lowest among Blue Jays relievers behind Roberto Osuna (.197) ... His 81 strikeouts in relief ranked T17th among American League relief pitchers. Averaged 10.36 strikeouts/9 IP, 2nd on the club behind Roberto Osuna (11.67) ... Stranded 42 of 54 (78%) inherited runners, ranking 4th in the A.L. (min. 50 inherited runners) ... Pitched on consecutive days 13 times during the season ... Struck out a season-high four batters three times (6/13 vs. TB, 6/16 vs. CWS & 7/20 at BOS) ... Tossed a career-high 3.0 IP vs. CWS (6/16) pitching the 2nd through 4th innings ... Posted a solid reverse split holding left-handed batters to a .183 BA (15-82) and right-handers at .211 (36-171) ... Recorded his first Major League save vs. BAL (9/11) tossing a scoreless inning with two strikeouts ... Made four relief appearances with Buffalo (AAA).
Split time between the Diamondbacks and the Triple-A Reno Aces...With Arizona he posted a 0-1 record, 6.33 ERA, and 23 strikeouts in 27 total innings...With Reno, Leone went 5-2 in 33 relief appearances, and recorded a 3.34 ERA and 36 strikeouts in 35 innings...In November, he was designated for assignment by the Diamondbacks...On November 18, was claimed off waivers by the Toronto Blue Jays.
Split the season between the Mariners and D-backs organizations following a six-player trade on June 3 that saw OF Mark Trumbo dealt to Seattle...Made 13 appearances between Seattle (10 games) and Arizona (3), going 0-5 with an 8.40 ERA (14 ER in 15.0 IP)...Placed on Double-A Mobile's disabled list on Aug. 14 with right shoulder tendinitis and missed the rest of the season.
Went 8-2, 2.17 ERA(16 ER, 66.1 IP) with 70 strikeouts inrookie campaign... Recorded second-most wins by a rookie relief pitcher in clubhistory behind Bill Risley (9 in 1994)and Ed Vande Berg (9 in 1982)... Tied for second among American League relief pitchers (T4 in MLB) with 8 wins... Among AL rookie relievers, ranked first in wins(8), second in strikeouts (70), third in ERA (2.17), third in Opponent Batting Average (.217), 4th in innings (66.1), tied for fourth in appearances (57) and tied for seventh in holds (7)... Went 3-0 with a 0.81 ERA (3 ER, 33.1 IP) in 25 G at Safeco Field... 57 appearances ranked 7th-most in rookie club history... Averaged 9.50 strikeouts per 9.0 innings pitched (70 SO, 66.1 IP), 8th-best by a rookie relief pitcher in club history... Made MLB debut on April 6 at OAK with a scoreless IP…allowed a double to ﬁrst batter faced but pitched out of jam without allowing a run... Selected from Triple-A Tacoma on April 4; reported to Tacoma but did not appear in a game.
Began season with Clinton, appearing in 3 games before being promoted to High Desert on April 15…after allowing 9 runs over first 13.0 innings (7 G) with the Mavericks, allowed only 2 runs over final 27.0 innings (0.67 ERA)…promoted to Jackson on July 13…tossed a season-high 17.2 scoreless innings (15) between High Desert and Jackson, June 16-Aug. 3…finished 2nd amongst all Mariners farmhands with 16 saves combined…did not allow a run, going 16-for-17 in save opportunities combined (0.00 ERA/0 ER, 19.1 IP); limited opponents to a .095 average (6x63) with 3 walks and 28 strikeouts in save situations…led the Arizona Fall League in 2013 with 6 saves (0-1, 3.00 ERA, 11 G, 15 K, 1 BB) for the Peoria Javelinas.
Began pro career with Everett…finished tied for the team lead in saves and appearances…held opponents scoreless in 15 of 19 appearances, including tossing 12.2 scoreless innings over 8 games, July 8-Aug. 7…limited opponents to a .177 (20x113) average, including a .118 (8x68) clip vs. righties…his .177 opponent batting average ranked as the 4th-lowest amongst Northwest League relievers…recorded first career win June 21 vs. Spokane (2.1,0,0,0,0,1)…participated in Mariners Instructional League.