From SABR member John Dewan at ACTA Sports on September 2, 2014:
Before 2014, instant replays in baseball were restricted to disputed home runs, fair vs. foul, fan interference, and wall border calls. This season, the scope of replay expanded greatly with the introduction of a challenge system similar to the one in the NFL. Now, it’s possible for managers to challenge practically everything short of ball-and-strike calls, and they have taken advantage.
Between 2008 and 2013, the six years of the original replay system, only 384 replays were used and only 129 plays were overturned according to data collected by Baseball Info Solutions. With still a month to go this season, 1,056 replays have been used and 495 plays overturned. We are on pace for about 600 corrected calls that would previously have been missed.
Overall, replays are overturning calls at a higher rate than the previous system, but not all types of challenges have been equally successful.
Read the full article here: http://www.statoftheweek.com
Originally published: September 2, 2014. Last Updated: September 2, 2014.