Guerrero threw 11 pitches that hit 100 mph or better on the radar gun during a scoreless inning of relief Friday, Joe Frisaro of MLB.com reports. He hit triple digits on seven straight pitches at one point, an absolutely overpowering display of heat. The key to Guerrero's long-term potential is refining his control and sharpening his slider, and the 28-year-old is showing signs of both in the early going. He's got a 0.00 ERA and 5:2 K:BB through 4.2 innings, and it wouldn't be surprising to see Guerrero leading the Marlins in saves by the end of the year.
Guerrero struck out two in a perfect sixth inning during Thursday's loss to the Rockies. The flamethrower touched 99 mph with his fastball in overpowering the bottom of the Colorado order. Guerrero is one of a number of raw but intriguing arms in the Miami pipeline, and if he can sharpen his control, the 6-foot-8 right-hander could work his way into the Marlins' unsettled closer mix before the season is over. Guerrero still has a lot to prove before he should be viewed as anything more than a lottery ticket for fantasy purposes, however.
Guerrero struck out two in a perfect inning of relief during Thursday's Grapefruit League game against the Astros. The flamethrowing right-hander has yet to give up a run this spring in 4.2 innings -- in fact, he's only allowed one hit -- but his 3:2 K:BB is a reminder that despite his triple-digit fastball, Guerrero is still a work in progress. He'll open the season in a set-up role for a Marlins bullpen that doesn't have an established closer, which does make him an intriguing saves lottery ticket in deeper formats, but Guerrero will need to show improved control and a more developed offspeed pitch to have a real shot at ninth-inning success.
Guerrero (back) was reinstated from the 10-day DL prior to Tuesday's game, Andre Fernandez of the Miami Herald reports. Guerrero will return to the Marlins' bullpen following a four-week stay on the disabled list due to a left lumbar strain. He was able to appear in three minor-league games while on a rehab assignment, and should be ready for action heading into Tuesday's tilt with Atlanta.
Guerrero (back) is expected to return from the disabled list within a day or two, Joe Frisaro of MLB.com reports. Guerrero has been out since early July with a left lumbar strain. Prior to the injury, the 6-foot-8 righty had posted a mediocre 4.28 ERA. His 13.0 percent walk rate is too high for him to be particularly trustworthy, though his 29.4 percent strikeout rate and triple-digit heat leave him near the top of the Marlins' closer depth chart. Miami retained both Kyle Barraclough and Drew Steckenrider through the deadline, though, so Guerrero is unlikely to close anytime soon.