Major League Baseball has suspended four Minor League pitchers after they were caught using illegal foreign substances to doctor baseballs.

Marcus Evey of Low-A Kannapolis (Chicago White Sox), Sal Biasi of High-A Winston Salem (White Sox), Kai-Wei Teng of High-A Eugene (San Francisco Giants) and Mason Englert of Low-A Down East (Texas Rangers) were all suspended 10 games.

The use of tacky substances -- mixtures often involve sunscreen and rosin -- is suspected to have spiked in recent seasons as pitchers have learned the extent to which illicit sticky stuff can increase the spin rates on their fastballs.