Lyles opened the 2018 season in a relief role for the Padres, posting a 3.66 ERA and 16:7 K:BB across 19.2 innings before replacing Robbie Erlin in the starting rotation in May. The right-hander was wildly inconsistent as a starter, allowing four or more runs in four of his eight starts while allowing just four total runs in his other four starts. Forearm tightness sent Lyles to the disabled list at the end of June and forced him to miss more than a month. Once activated, he was sent to the bullpen, where he made a trio of appearances before being traded to the Brewers in August. He increased the usage of his curveball and fastball with Milwaukee, which resulted in an improved ERA and strikeout rate. Lyles signed with Pittsburgh after the Brewers declined his option. He'll compete for a rotation spot, and both Lyles and the Pirates believe his changes can translate to success as a starter.

Despite a lackluster spring showing, Lyles managed to crack the Rockies' Opening Day roster in a long-relief role. He found little success in this role however, as he struck out just 6.4 batters per nine innings and gave up 11 homers in 46.2 frames. The Rockies finally cut ties with the right-hander and designated him for assignment in late July. Lyles found a new home shortly thereafter, with the Padres picking him up on a minor-league deal. A decent performance in the minors allowed him to return to the big leagues for a handful of starts down the stretch. His ERA wound up rising to 9.39, although an extremely high .412 BABIP played a part in that. The Padres brought him back and he figures to compete for a rotation spot in camp, but Lyles' profile and body of work should keep him off most fantasy radars heading into 2018.

Lyles' 2016 campaign was up-and-down. The 26-year-old started the season on a high note by landing a spot in the Rockies' rotation. Things went south quickly, however, as he was shelled in his first few starts and was promptly sent down to Triple-A Albuquerque for more seasoning. Following a bit of time shuttling between the majors and the minors, Lyles found his stride as a reliever over the summer with Colorado, posting a solid 2.88 ERA and a stellar 0.5 HR/9. The right-hander scuffled at the end of the season to bring his season ERA up to 5.83, but he did manage to show that he could pitch effectively at the major league level. That being said, his strikeout ability still didn't come to fruition (4.91 K/9), which hurts his already low value. To make matters worse, many Rockies pitching prospects are knocking on the door of the major league rotation, which could force Lyles into the bullpen for good, and given his low K rate, it will be tough for him to carve out a high-leverage role if that is his fate.

Lyles was poised to be a frontline starter for the Rockies in 2015, but a toe injury that required surgery cut his campaign short in June. Prior to the injury, Lyles performed with mixed results. The 25-year-old held a 2.92 ERA through late April, but the wheels began to fall off afterward, which was reflected in his final line. He continued to be a groundball pitcher in 2015 (2.32 groundball/flyball ratio), which should translate to some success while pitching in an environment like Coors Field. However, he'll have to improve his 1.58 K/BB and .325 BABIP to have much value going forward.

The main get for the Rockies in the deal last winter that sent Dexter Fowler to the Astros, Lyles was expected to open 2014 at Triple-A after languishing in the majors a season earlier. Not only did Lyles surprisingly crack the Rockies’ rotation out of spring training, but he became one of the team’s more reliable starters through the first two months. The 24-year-old covered at least six innings in seven of his first 11 outings, going 5-1 with 3.46 ERA over 65 innings during that span. That would represent the peak of the season for the right-hander, who broke his non-throwing hand in a June 4 start, resulting in a two-month absence. Lyles’ productivity tailed off upon returning in August, but he finished with an acceptable 4.33 ERA, with his FIP (4.22), BABIP (.295) and strand rate (71.3%) suggesting it wasn’t a byproduct of an inordinate amount of luck. He looks poised to develop into a sturdy mid-rotation arm for Colorado, though a weak strikeout rate (6.3 K/9) may never make him an especially enticing fantasy option.

Lyles, 23, endured another rough season in the Astros' starting rotation, posting numbers that were nearly identical to the year prior. In 27 appearances (25 starts), the right-hander pitched to a 7-9 record with a 93:49 K:BB ratio in 141.2 innings. His 5.59 ERA and 1.51 WHIP ranked among the worst in baseball and he had five outings during which he allowed seven earned runs or more. Lyles, like most young pitchers, has experienced growing pains early in his career. He has been very hittable, allowing opposing batters to hit .283 against him, but if he can bring that number down this season, he's likely to take a step forward in his development. Acquired by the Rockies as part of the Dexter Fowler trade in December, Lyles now faces the challenge of minimizing the damage of the contact he surrenders in the most hitter-friendly home park in baseball.

One has to wonder why Lyles has not emerged as the star the 2008 supplemental draft pick was expected to become to this point. Through 235.1 career innings, Lyles sports a stomach-turning 5.20 ERA, allowing far too many home runs and turning average hitters into All-Stars with a career .281 batting average against. Part of the problem may be that Lyles was pushed too aggressively through the minors, and perhaps he should have spent a little more time at Triple-A. Still, he's too good of a prospect for the Astros to cut bait, so the Astros will in all likelihood keep him in the rotation. The problem is the Astros need a proven innings eater, which Lyles has not been thus far.

The young righty received on-the-job training in Houston last season, landing in the starting rotation probably a bit before he was ready to do so. He faded in the final two months with a 7.76 ERA after Aug. 1 but overall the results weren't all that terrible: 4.41 ERA, 1.292 WHIP and a 2.72 K/BB. In fairness, Lyles was overhyped a bit in years past, mainly because as he was the lone true prospect in a bereft Astros farm system. He'll need to work on keeping the ball in the park better next year, but the potential is there. With the glimmer of "impact rookie" now lifted, he is seen better for his true ceiling as a competent No. 3 and likely Astros regular for years to come.

Lyles had a nice 2010 season at the upper levels of the minor leagues, combining for a 3.57 ERA and 137 strikeouts between Double-A and Triple-A. He swooned a bit in September at Round Rock, but he probably just ran out of gas in an otherwise amazingly steady year. Lyles has clean and easy mechanics, hitting 93-94 mph on his best days and usually working right around 90-91. There has been some talk that the Astros will give Lyles a shot to break camp with the team as their No. 5 starter, but the more likely scenario is a midseason callup after some additional Triple-A seasoning.

Despite starting off the season very shaky (5.00 ERA and .280 BAA through his first five starts), Lyles showed his dominance in 2009, racking up a 3.24 ERA, 1.189 WHIP and a 10.4 K/9IP. He is just 19 years old, yet he exhibits the polish of someone three years his senior. Lyles projects as a No. 3 starter, and is probably at least a few years away from a debut in Houston, although he could move very quickly through an organization that remains thin on promising talent.