Home Runs Totals
Home run totals for the first ten games of the season over the last three seasons.
Coefficient of Restitution Tests (Averages)
The NPB's lower and upper limits were 0.4134 and 0.4374 between 2011 and 2013.
The limits were adjusted to 0.4034 and 0.4234 before the start of the 2014 season.
Coefficient of Restitution Tests (Stadiums)
Home Run Totals and Averages by League
Avg is Average Home Runs per Game
- Baseballs were randomly taken from six stadiums on Thursday for re-testing. Results are expected out later this month.
- The NPB has about 10,000 boxes of baseballs (twelve in a box) in stock. There are no plans, at this time, to change stock since there are no other alternatives. That could change based on results from the re-testing.
- Results from tests conducted during the pre-season were high, but did not go over the set limit.
- There were rumblings that the ball seemed different when the season started.
- Travel distances can change by about twenty centimeters for every 0.001 change in the coefficient of restitution.
[UPDATE 4/12 @ 11:54am]
Baseballs tested during the pre-season (March 19) averaged 0.421, which is close to the upper limit, but not over. Balls tested after the start of the season may have been affected by a number of variables unique to each stadium, like temperature, humidity, and storage conditions.
Source: Sponichi 4/12/2014
[UPDATE 4/12 @ 12:58pm]
The NPB will turn to a bidding system for baseballs for the 2016 season. Since the NPB wants to have a supply for the start of fall camp in 2015, production will have to begin around April 2015.
Source: Sponichi 4/12/2014
[UPDATE 4/12 @ 3:46pm]
NPB officials visited QVC Marine and Yokohama Stadium on Friday and met with teams to provide formal explanations and apologies.
Source: Daily Sports 4/12/2014
[UPDATE 4/13 @ 12:12am]
Tests were conducted on baseballs taken from six stadiums. Sanspo reports that Mizuno representatives usually take about thirty boxes of baseballs (twelve in each box) to each of the six stadiums before the start of a series. Additional boxes are provided as needed. At five of the stadiums, the baseballs are stored in the umpire's room. At Seibu Dome, the balls are stored near an entrance at Seibu 2 Stadium, with Mizuno representatives carrying balls to Seibu Dome for each game. A Seibu official told reporters they did nothing special with their baseballs but did order them at a different time than other teams, which could explain the difference in the averages.
Source: Sanspo 4/12/2014
[UPDATE 4/13 @ 9:23pm]
The NPB is planning to test baseballs as many times as necessary to find the cause for the increase in the coefficient of restitution. The Japan Vehicle Inspection Association (JVIA), responsible for conducting the tests, will receive the new batch of baseball taken from stadiums after the 10th on Monday. Results could be ready as early as Friday.
Baseballs are kept in a room located at the JVIA facilities for forty-eight hours to make sure they are not affected by storage conditions at various stadiums. Humidity and temperature are regulated. Various adjustments could be made to how long the balls are kept in the room before testing to ensure more accurate results.
Source: Sports Hochi 4/13/2014