Only three MLB relievers threw a 103 mph pitch last year. The Marlins have one of them

There’s no secret to Tayron Guerrero’s strength whenever he steps onto the mound.

He throws hard.

The number to look at: 103 mph.

Guerrero hit that mark with his four-seam fastball four times during a 17-pitch relief appearance on Aug. 13 against the Atlanta Braves.

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For context, Guerrero was one of only three pitchers to throw a pitch that clocked in at 103 mph or faster. The other two: the New York Yankees’ Aroldis Chapman and the St.