With the end of his second Major League Baseball season approaching, Kyle Harrison is determined to unravel the enigma around his diminishing fastball velocity. The young left-hander for the San Francisco Giants has seen a decline in velocity, which has been a cause for concern over the second half of the season. Harrison's fastball used to go as high as 96 mph, but in recent outings, it has regularly been around the low 90s. The 23-year-old is not only disappointed with his performance but also eager to find a remedy as a result of this decrease. Struggles Against the Diamondbacks Highlight Issue Harrison's velocity problems were on display in Tuesday's 8-7 loss to the Arizona Diamondbacks, as he gave up a career-high tying six earned runs. His fastball had a notable decline from the 94.3 mph he averaged during his stellar home debut last year, peaking at 93.2 mph on average. The problem Harrison has when his velocity isn't where it should be is shown by Randal Grichuk's two-run home