during the 2014 season, the atlantic league of professional baseball instituted its own changes. these included using a 12-second pitch clock, reducing timeouts and warm-up pitches, and making intentional walks automatic by signalling the umpire, rather than throwing four intentional balls. the arizona fall league began using a pitch clock in 2014 and the double-a and triple-a levels of minor league baseball followed suit in 2015. those levels saw a 12-minute reduction in game times.