Duffy finished second in the National League Rookie of the Year voting a season ago behind Kris Bryant of the Chicago Cubs. He made the Giants out of spring training and went on to hit .295/.334/.428 (169-for-573) in 149 games while leading major league rookies in hits and ranking second in batting average, RBI and slugging percentage. His 70 RBI and 46 extra-base hits were both the most by a Giants rookie since Chili Davis in 1982. He also became the first Giants rookie to ever win the Willie Mac Award, which is given to the player who best exemplifies the inspiration, character and leadership demonstrated by Hall of Famer Willie McCovey during his playing days in San Francisco.
Duffy was an 18th-round selection by the Giants in the 2012 June Draft out of Long Beach State University, which also produced current Rays third baseman Evan Longoria.
Fox, 19, grew up in the Bahamas, played high school baseball in Florida and moved back to the Bahamas before signing with the Giants as an international free agent in July 2015. He was ranked by MLB.com as the No. 3 international prospect in the 2015 class and entered this season ranked by Baseball America as the No. 4 prospect in the Giants system. He is batting .207/.305/.277 (59-for-285) in 75 games this season with Class-A Augusta, and his 25 stolen bases rank sixth in the South Atlantic League.
Santos, 21, is 4-2 with a 2.91 ERA (58.2-IP, 19-ER) in 10 games (all starts) with Class-A Augusta this season. He entered the season ranked by Baseball America as the No. 19 prospect in the Giants system. Over parts of four minor league seasons, he has gone 9-9 with a 2.84 ERA (177.2-IP, 56-ER) in 37 games (36 starts). He signed with the Giants as a free agent out of the Dominican Republic in 2012.
Moore, 27, is 7-7 with a 4.08 ERA (130-IP, 59-ER) in 21 starts this season. Since June 12, Moore is 5-3 with a 2.39 ERA (60.1-IP, 16-ER) in nine starts, ranking fifth in the American League in ERA over that span. Over parts of six seasons with the Rays (2011-16), he went 39-28 with a 3.88 ERA (540-IP, 233-ER) and overcame Tommy John surgery in April 2014. He finishes his Rays career ranking among the franchise's all-time leaders with 39 wins (sixth), a .582 winning pct. (fourth; min. 50 decisions), 94 starts (tied for sixth) and 494 strikeouts (fifth).
Moore enjoyed his best season in 2013, when he compiled a 17-4 record and 3.29 ERA and was named an American League All-Star. He started Game 1 of the American League Division Series in both 2013 (vs. Boston) and 2011 (vs. Texas), when the 22-year-old became the youngest starting pitcher ever to win his team's postseason opener.