SAN FRANCISCO — Carson Whisenhunt’s third start in the majors encapsulated why he’s far from a finished product, as well as why he’s the Giants’ top pitching prospect.

Regarding the former, Whisenhunt allowed three runs on three homers over four innings and took his first loss as the Giants fell 4-2 to the Washington Nationals. He also walked three batters and allowed lots of hard contact. Regarding the latter, Whisenhunt struck out five batters and induced 19 swings-and-misses, including 11 with his signature changeup.

Opposing hitters were 1-for-18 against Whisenhunt’s sinker in his first two starts, but Whisenhunt allowed four hits on his sinker — including all three solo homers — against Washington. Along with the hits, the Nationals generated six batted-balls of at least 103 mph, th

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