Graduated from Scranton High School in Scranton, PA. After his senior year, The Scranton Times-Tribune named him their Male High School Athlete of the Year... Attended the University of Virginia and played college baseball for the Virginia Cavaliers...his 2015 season debut was delayed by back surgery...in three seasons at Virginia, he played in 162 games with a .294 batting average, 12 home runs, 25 stolen bases in 27 attempts, and 111 RBIs, with 113 walks and 86 strikeouts.
On July 31, the Rays traded McCarthy to the Giants in exchange for minor league LHP Jacob Lopez...McCarthy was assigned to Triple-A Sacramento and hit .165 with a homer and four RBI in 79 at-bats.
Was limited to 47 games with Durham due to a back injury…was placed on the disabled list on May 25 and missed nearly three months…played in 3 games with the GCL Rays on a rehab assignment and was transferred to Class-A Charlotte for 3 games after his reinstatement....Between the three levels, hit .244/.356/.461 (44for-180) with 8 HR and 27 RBI…his 8 HR tied a career high despite missing significant time...Hit .294 (10-for-34) with 3 2B, 1 3B, 2 HR and 6 RBI in 9 games in the International League postseason, helping the Bulls win a second consecutive Governors' Cup…hit a 1st-inning solo homer and 4th-inning bases-clearing double in the Governors' Cup-clinching win over Scranton/Wilkes-Barre (Yankees)...Hit .239/.375/.370 (11-for-46) with 1 HR and 8 RBI in 13 games for the Peoria Javelinas in the Arizona Fall League...Ranked by Baseball America as the No. 25 prospect in the Rays system following the season.
Led the Southern League with 90 BB and tied for 1st with 8 3B…also ranked among league leaders in avg. (.284, 10th), runs (76, 5th) doubles (31, tied for 3rd) and on-base pct. (.409, 2nd)…spent the entire season with Double-A Montgomery and was named to the SL postseason All-Star Team…hit 2 HR in the 5-game series loss to Chattanooga (Twins) in the SL Semifinals…named SL Player of the Week for June 19-25 and July 17-23…named to the Rays Organizational All-Star Team by MLB.com…ranked by Baseball America as the No. 17 prospect in the Rays system following the season…the publication also tabbed him as having the Best Strike-Zone Discipline in the organization… ranked as the Best Defensive First Baseman in the SL in its Best Tools survey.
Split the season between Class-A Bowling Green and Class-A Charlotte, batting .285/.398/.430 (100-for-351) with 21 2B, 8 HR and 60 RBI…combined to appear in 60 games (58 starts) at first base, his first professional action there…finished 8th among Rays minor leaguers in avg. …named to the Rays Organizational All-Star Team by MLB.com… ranked by Baseball America as the No. 20 prospect in the Rays system following the season.
Named to the New York-Penn League midseason All-Star Team in his first professional season…ranked 7th in the NYPL with 18 SB.