Just over half of ball, strike challenges successful in spring training openers
Just over half the ball/strike challenges were successful on the first day of spring training games Friday as Major League Baseball prepared for the first regular-season use of the automated ball-strike system — the so-called robot umpires.
Thirteen of 23 calls were overturned during the five games, MLB said, which came to 56.5 per cent.
There were an average of 4.6 challenges per game and 2.6 overturned calls per game.
Seven challenges were made of plate umpire Alex MacKay’s calls during Arizona’s 3-2 win over Colorado, and six were successful. The Diamondbacks had four of five decisions reversed and the Rockies were 2-for-2 in challenges.


