Munoz, the best relief-pitching prospect in baseball, can touch 103 mph with his fastball and may reach the big leagues this year as a 20-year-old. A dominant showing as the youngest player in the Arizona Fall League in 2017 served as his coming out party. Regularly touching triple digits as an 18-year-old can have consequences, and he was held back in extended spring training at the outset of 2018 with a tender elbow. After a PRP injection, Munoz was ready to make his season debut with short-season Tri-City in mid-June. He struck out nine in 5.2 hitless innings, leading to him getting promoted over Low-A and High-A to the Texas League, where he was the league's youngest player. His lower half is strong, but he is still adding good weight to his upper body. His mid-80s slider needs refinement, but he already commands an 80-grade fastball, so his secondary offering just needs to be OK for him to develop into one of the best closers in baseball. Read Past Outlooks